Managing back pain from desk work | Learn German in English

Sentence explanations

1. Mein unterer Rücken tut weh, nachdem ich den ganzen Tag an meinem Schreibtisch gesessen habe.

   My lower back hurts after sitting at my desk all day.

   Mein

   my

   unterer

   lower

   Rücken

   back

   tut weh

   hurts

   nachdem

   after

   ich

   I

   ganzen

   whole; entire

   Tag

   day

   meinem

   my

   Schreibtisch

   desk

   gesessen

   sat

   habe

   have

   More detail

   Mein means “my” here and is the possessive determiner for Rücken. Because Rücken is masculine singular and the noun phrase is the subject, the form is nominative singular masculine: mein Rücken. Possessive determiners take endings like an article; compare meine Hand (feminine) and mein Bein (neuter). unterer describes the lower part of the back. Its base form is unter; in unterer Rücken, the adjective has the masculine nominative singular ending -er after the possessive determiner. The opposite is oberer “upper,” as in oberer Rücken. Rücken is the masculine noun “back.” The phrase mein unterer Rücken is therefore “my lower back,” with Rücken as the head noun and unterer describing it. tut weh is the present-tense third-person singular form of the separable verb wehtun, used for physical pain: “hurts.” The verb is written as one word in its base form, but in the main clause its parts appear separated: Mein Rücken tut ... weh. For example, Mein Fuß tut weh. means “My foot hurts.” nachdem introduces a time clause meaning “after.” In the clause it introduces, German places the conjugated verb at the end. The pattern is nachdem + subject + ... + conjugated verb. ich is the first-person singular subject pronoun, “I.” It identifies the person who sat at the desk; it is not the grammatical subject of tut weh, whose subject is Rücken. ganzen modifies Tag in den ganzen Tag, meaning “all day” or literally “the whole day.” Its base form is ganz; here it has the masculine accusative singular ending -en after den. Tag is masculine, and the accusative marks this phrase as the duration expression for how long the sitting lasted. Tag is the masculine noun “day.” In den ganzen Tag, it is part of a common duration expression: den ganzen Tag arbeiten means “work all day.” meinem means “my” here and belongs to Schreibtisch. The phrase an meinem Schreibtisch uses dative because an expresses a fixed location here, not movement toward a destination. For a masculine or neuter dative singular noun, mein becomes meinem; compare an meiner Tür with a feminine noun. Schreibtisch is the masculine noun “desk.” The compound consists of Schreib- “writing” and Tisch “table,” but it is used as the ordinary word for a desk. In an meinem Schreibtisch, it is the object of the location phrase “at my desk.” gesessen is the past participle of sitzen, “sit.” It is used with the auxiliary habe to form the perfect: habe gesessen = “have sat” or, in this time relation, “have been sitting.” Do not confuse it with gesetzt, the participle of setzen (“set; seat”), which describes putting someone or something into a sitting position. habe is the first-person singular present form of haben, “have.” With ich, the perfect form is ich habe ... gesessen. Because this is a nachdem clause, habe comes at the end: nachdem ich den ganzen Tag an meinem Schreibtisch gesessen habe. Together, Mein unterer Rücken tut weh says “My lower back hurts.” The time clause nachdem ich den ganzen Tag an meinem Schreibtisch gesessen habe adds that this happens after I have spent the whole day sitting at my desk. The complete utterance is: “My lower back hurts after sitting at my desk all day.”

2. Dein Stuhl gibt dir vielleicht nicht genug Halt.

   Your chair might not be giving you enough support.

   Dein

   your

   Stuhl

   chair

   gibt

   gives

   dir

   to you

   vielleicht

   perhaps; might

   nicht

   not

   genug

   enough

   Halt

   support

   More detail

   Dein means “your” and belongs to the person being addressed. It is the possessive determiner before Stuhl; its form here is nominative masculine singular because Stuhl is masculine and is the subject. The possessor’s gender does not determine this form. Compare dein Stuhl (“your chair”) with deine Tasche (“your bag”), where the noun’s grammatical gender and number require a different form. Stuhl means “chair.” Its plural is Stühle. In this sentence it is the subject of gibt, so it appears in the nominative: Dein Stuhl gibt ... (“Your chair gives ...”). gibt is the third-person singular present form of geben (“to give”). The subject is Dein Stuhl, so the singular form is used: Der Stuhl gibt Halt (“The chair provides support”). The present tense describes what the chair may currently be providing; German does not need a separate progressive form here. dir is the dative form of du (“you”). geben commonly uses the pattern jemandem etwas geben: a recipient in the dative and the thing given as the direct object. Here dir identifies the recipient, “to you,” while Halt is what is provided. The pair is du (subject form) → dir (dative form). vielleicht means “perhaps” or “maybe.” Here it makes the statement uncertain: the chair may provide insufficient support, but the sentence does not assert that this is definitely so. For example, Vielleicht regnet es. means “Maybe it is raining.” nicht is the standard negation word. It negates the sufficient amount expressed by genug Halt, producing “not enough support,” rather than negating the existence of the chair or the recipient. German negation is interpreted with the surrounding phrase, so nicht genug corresponds to “not enough.” genug means “enough” or “sufficient.” It can come before a noun, as in genug Zeit (“enough time”), and it does not take an ending in this use. In nicht genug Halt, the amount of support is below what is needed. Halt is a masculine noun meaning “support,” “stability,” or “something that holds a person securely.” In this context, the intended meaning is physical support from the chair, not a command such as “Stop!” The expression jemandem Halt geben is a useful pattern meaning “to give someone support” or “to provide someone with stability.” Putting the parts together, Dein Stuhl is the subject, gibt dir says that it provides something to you, vielleicht marks the possibility, and nicht genug Halt says that the support is insufficient. The whole utterance therefore means: “Your chair might not be giving you enough support.”

3. Ich beuge mich auch nach vorne, weil mein Bildschirm zu weit weg ist.

   I also lean forward because my monitor is too far away.

   Ich

   I

   beuge mich

   bend/lean

   auch

   also

   nach vorne

   forward

   weil

   because

   mein

   my

   Bildschirm

   monitor

   zu weit weg

   too far away

   ist

   is

   More detail

   Ich is the first-person singular pronoun, “I.” It identifies the speaker as the person performing the action. A useful contrast is du (“you,” singular informal): Ich sitze. — “I am sitting.” beuge mich comes from the reflexive verb sich beugen (“to bend or lean”). In this sentence, beuge is the first-person singular present form, and mich is the matching reflexive pronoun. The direction phrase nach vorne specifies where the movement is directed. Compare the reusable pattern Ich beuge mich nach rechts. — “I lean to the right.” auch means “also/too” and adds this action to something already relevant. It does not itself identify what the comparison is; here the fixed translation supports “also” as part of the speaker’s statement. Ich komme auch. means “I am coming too.” nach vorne expresses movement or orientation toward the front: “forward.” nach is used here in a directional expression, while vorne means “at/to the front” in that expression. Beuge dich nach vorne. — “Lean forward.” weil introduces the reason for the main clause: “because.” In a German weil clause, the finite verb normally goes to the end. The reason starts with weil and ends with ist in this sentence. mein means “my” here and agrees with the noun it modifies. Bildschirm is masculine singular, and because it is the subject of ist, the possessive form is nominative masculine singular: mein Bildschirm. The form changes with the noun’s grammatical case and number: mein Bildschirm (“my monitor”), but meinen Bildschirm when the same masculine singular noun is an accusative object, as in Ich sehe meinen Bildschirm. — “I see my monitor.” Bildschirm means “monitor” or “screen.” It is the subject of the reason clause: the monitor is the thing whose distance is being described. Der Bildschirm ist hell. — “The monitor is bright.” zu weit weg means “too far away.” weit weg describes distance, and zu makes the degree excessive for the relevant purpose. This is not simply “very far away”: zu weit weg means farther away than is suitable or wanted in the situation. Der Tisch ist zu weit weg. — “The table is too far away.” ist is the third-person singular present form of sein (“to be”). The subject is mein Bildschirm, so the singular form is required. In the weil clause it appears at the end: weil mein Bildschirm zu weit weg ist — “because my monitor is too far away.” Together, Ich beuge mich auch nach vorne says “I also lean forward,” and weil mein Bildschirm zu weit weg ist gives the reason. The complete utterance means: “I also lean forward because my monitor is too far away.”

4. Wenn du den Bildschirm näher stellst, könnte das deinen Rücken entlasten.

   Moving the screen closer could take some pressure off your back.

   Wenn du

   if you

   den Bildschirm

   the screen

   näher

   closer

   stellst

   position / place

   könnte

   could

   deinen Rücken

   your back

   entlasten

   relieve pressure on

   More detail

   Wenn du introduces a condition: “if you …”. Here, du is the informal singular “you”, and the finite verb comes at the end of the clause. Example: Wenn du Zeit hast, ruf mich an. — “If you have time, call me.” den Bildschirm means “the screen” here. Bildschirm is a masculine noun, so the definite article is den in the accusative when the screen is the thing being positioned. The useful forms are der Bildschirm (nominative) and den Bildschirm (accusative). Example: Ich sehe den Bildschirm. — “I see the screen.” näher is the comparative form of nah (“near/close”): nah → näher (“closer”) → am nächsten (“closest”). Here it describes a closer position. Example: Stell den Stuhl näher. — “Move the chair closer.” stellst is the present-tense second-person singular form of stellen (“to place, position, put”). With du, the form is du stellst; the object being positioned is den Bildschirm. In this sentence, näher stellen means “position closer” or “move closer.” Example: Du stellst die Lampe ans Fenster. — “You place the lamp by the window.” The combination Wenn du ... stellst forms the condition. German places stellst at the end of this subordinate clause. A conditional clause can come first, as here, or after the main clause: Das könnte helfen, wenn du den Bildschirm näher stellst. — “That could help if you move the screen closer.” könnte expresses a possible result: “could” or “might.” It is the Konjunktiv II form of können (“can, be able to”), used here for a potential rather than a certain effect. Because the subject of the main clause is das, the form is das könnte; the following verb remains in the infinitive. Example: Das könnte funktionieren. — “That could work.” deinen Rücken means “your back.” Rücken is a masculine noun; after entlasten, it is the direct object in the accusative, giving deinen rather than nominative dein. dein- identifies the informal singular possessor “your”, while the ending -en reflects the masculine accusative noun Rücken. Example: Ich schone meinen Rücken. — “I take care of my back.” entlasten means “to relieve pressure on” or “to ease the strain on.” It is an infinitive here because könnte is a modal verb; the infinitive comes at the end of the main clause. The direct object is deinen Rücken, so the construction is jemanden/etwas entlasten or, as here, den Rücken entlasten. Example: Diese Haltung entlastet den Nacken. — “This posture relieves pressure on the neck.” Together, Wenn du den Bildschirm näher stellst gives the condition “if you move the screen closer.” das refers to that proposed action as the subject of the possible effect, and deinen Rücken entlasten says what effect it could have. The complete meaning is: “Moving the screen closer could take some pressure off your back.”

5. Ich habe auch daran gedacht, mich in kurzen Pausen zu dehnen.

   I was thinking about stretching during short breaks.

   Ich habe

   I have

   auch

   also

   daran gedacht

   thought about it

   mich

   myself

   kurzen

   short

   Pausen

   breaks

   dehnen

   stretch

   More detail

   Ich habe is the first-person singular form of haben, “to have.” Here it is the finite auxiliary in the perfect tense: haben + the past participle gedacht expresses a completed or viewed-as-complete thought. The subject is ich, “I.” auch means “also” or “too.” It adds this idea to other possibilities or considerations; it does not itself specify what those other considerations were. daran gedacht comes from denken, “to think.” The useful pattern is an etwas denken (“think about something”) and, for an action, daran denken, etwas zu tun (“think about doing something”). The observed form gedacht is the past participle of denken; its simple-past form is dachte. In this sentence, daran gedacht, mich ... zu dehnen means having thought about stretching oneself. mich is the first-person singular accusative reflexive pronoun. It refers back to the speaker, so the speaker is the person who would stretch. German uses reflexive forms when the actor and the affected person are the same: ich dehne mich means “I stretch.” The form changes with the person and case; for example, du dehnst dich means “you stretch.” in kurzen Pausen means “during short breaks.” Pausen is the plural of the noun Pause, “break.” In this temporal use, in takes the dative, so the plural adjective is kurzen; kurz means “short.” With a different case, the adjective form can change, as in kurze Pausen for “short breaks” in an accusative or nominative context. dehnen means “to stretch.” This is the infinitive, the base form used after zu in mich zu dehnen. The reflexive pattern sich dehnen means “to stretch oneself”; a related but different use can describe stretching another thing, for example Sie dehnt den Stoff — “She stretches the fabric.” Together, daran gedacht, mich in kurzen Pausen zu dehnen gives the content of the thought: thinking about stretching oneself during short breaks. With the perfect construction Ich habe ... gedacht and the additive auch, the complete utterance means: “I was thinking about stretching during short breaks.”

6. Leichtes Dehnen kann helfen, aber hör auf, wenn es die Schmerzen verstärkt.

   Gentle stretching may help, but stop if it increases the pain.

   Leichtes

   gentle

   Dehnen

   stretching

   kann

   may; can

   helfen

   help

   hör auf

   stop

   wenn

   if; when

   Schmerzen

   pain

   verstärkt

   increases; makes stronger

   More detail

   Leichtes modifies the nominalized infinitive Dehnen. Its ending -es marks neuter singular in this article-free noun phrase; German capitalizes nominalized infinitives. The adjective means “gentle” here. Compare leicht “light/easy” and the comparative leichter “lighter/easier”; here it characterizes the stretching, not its difficulty. Dehnen is the infinitive dehnen, “to stretch,” used as a noun meaning “stretching.” This is a useful German pattern: an infinitive can be capitalized and used as a noun, as in Lesen “reading.” The previous sentence uses dehnen as an ordinary infinitive after mich ... zu. kann helfen combines können “can/may” with helfen “to help.” kann is the present-tense third-person singular form of können, and the following verb remains in the infinitive. Here it expresses possibility: the stretching may help. Example: Das kann helfen. — “That may help.” helfen means “to help.” Its present-tense forms include ich helfe, du hilfst, and er/sie/es hilft; the vowel change in hilfst and hilft belongs to this verb. With a modal such as kann, the infinitive helfen appears at the end of the clause. hör auf is the informal singular imperative of the separable verb aufhören, “to stop.” In this command, hör comes first and auf goes to the end. The implied subject is du; this is not the formal Sie command. Example: Hör auf zu reden. — “Stop talking.” wenn introduces the condition “if” here. In a wenn clause, the conjugated verb normally goes to the end, as in wenn es ... verstärkt. Wenn can also mean “when” for a time reference, but the fixed translation establishes the conditional reading here. es is the third-person singular pronoun functioning as the subject of the conditional clause. Here it is translated as “it” and refers to the stretching activity described in the first clause. Its form is unchanged for nominative and accusative neuter singular, but here it is the subject, not the object. die Schmerzen means “the pain” in the fixed translation. Schmerzen is the plural form of Schmerz, “pain”; German can use this plural form for pain or painful sensations. die marks the definite plural here, and the plural form is the same in nominative and accusative. The noun phrase is the object of verstärkt. verstärkt comes from verstärken, “to increase” or “to make stronger.” It is the present-tense third-person singular form, agreeing with the subject es; the object is die Schmerzen. The prefix ver- is part of the verb verstärken; it is not an ending added to this particular form. Example: Das verstärkt den Schmerz. — “That increases the pain.” Together, Leichtes Dehnen kann helfen means “Gentle stretching may help.” The conjunction aber contrasts this possibility with the instruction hör auf — “stop.” Finally, wenn es die Schmerzen verstärkt supplies the condition: stop if the stretching increases the pain. The complete utterance is therefore: “Gentle stretching may help, but stop if it increases the pain.”

7. Wenn es anhält, sollte ich wahrscheinlich professionelle Hilfe suchen.

   If it continues, I should probably see a professional.

   Wenn

   if/when

   anhält

   continues

   sollte ich

   I should

   wahrscheinlich

   probably

   professionelle

   professional

   Hilfe

   help

   suchen

   seek/look for

   More detail

   Wenn introduces a condition: “if” or, depending on the situation, “when.” A reusable pattern is Wenn + clause, ... for saying what follows under a condition. In this sentence, the condition comes first. anhält is the third-person singular present form of anhalten, “to continue” or “to persist” in this use. The form matches the subject es; it is not the form for ich. Example: Der Regen hält an. — “The rain continues.” Here es is the grammatical subject of anhält, while the supplied sentence does not uniquely identify what es refers to. sollte ich combines ich (“I”) with sollte, the first-person singular form of sollen in the subjunctive II form. In this use, sollte gives advice or a recommendation: “I should.” The ordinary present form ich soll can report an instruction or expectation, whereas ich sollte presents the action more tentatively as advisable. Example: Ich sollte mehr schlafen. — “I should sleep more.” wahrscheinlich means “probably.” It modifies the recommendation, showing that the speaker considers it likely to be appropriate rather than stating it with certainty. Example: Sie kommt wahrscheinlich später. — “She will probably come later.” professionelle is the inflected form of the adjective professionell, “professional.” It describes Hilfe here. Because Hilfe is feminine singular and is the accusative object of suchen without an article, the adjective has the ending -e: professionelle Hilfe. The ending belongs to the adjective, not to the noun. Example: professionelle Beratung — “professional advice.” Hilfe is a feminine noun meaning “help” or “assistance.” In professionelle Hilfe suchen, it is the thing being sought. German uses Hilfe suchen for seeking assistance; the fixed translation expresses the same practical meaning as “see a professional.” suchen is the base form of the verb, “to seek” or “to look for.” It appears at the end because German places the infinitive after a modal verb such as sollen: Ich sollte Hilfe suchen — “I should seek help.” With a concrete object, suchen normally takes the accusative: Ich suche eine Lösung. — “I am looking for a solution.” Together, Wenn es anhält means “if it continues,” and sollte ich wahrscheinlich professionelle Hilfe suchen means “I should probably seek professional help.” The conditional clause sets the condition; the main clause gives the speaker’s cautious recommendation under that condition. The complete utterance therefore means: “If it continues, I should probably see a professional.”

8. Das gilt besonders, wenn sich die Schmerzen ausbreiten oder anfangen, deinen Schlaf zu beeinträchtigen.

   Especially if the pain spreads or starts affecting your sleep.

   Das gilt

   that applies

   besonders

   especially

   Schmerzen

   pain

   sich … ausbreiten

   spread

   anfangen

   start

   Schlaf

   sleep

   zu beeinträchtigen

   to affect

   More detail

   Das gilt means “that applies” here. gilt is the third-person singular present form of gelten (“to apply; to be valid”). Das is a neuter demonstrative pronoun referring to an understood statement or situation; the fixed sentence does not identify a more specific referent on its own. besonders means “especially.” It highlights the condition introduced by the following wenn clause. Here, wenn has the conditional meaning “if,” matching the fixed translation. Schmerzen means “pain” here. It is the plural form of der Schmerz (“pain”). In this sentence, die Schmerzen is the plural subject of the clause, so die is the plural nominative article. The translation naturally renders this meaning as singular “the pain”; that does not change the observed German form. sich ausbreiten means “to spread” or “to extend.” ausbreiten is the base verb, and sich is part of the reflexive verb used here. In wenn sich die Schmerzen ausbreiten, the plural subject die Schmerzen takes the present-tense form ausbreiten, which happens to look like the infinitive. anfangen means “to start” or “to begin.” Here it is the second coordinated present-tense verb with the plural subject die Schmerzen; its form is therefore anfangen. It introduces the infinitive construction zu beeinträchtigen: anfangen, etwas zu beeinträchtigen means “start to affect something.” Schlaf means “sleep.” In deinen Schlaf, it is masculine singular and is the accusative direct object of beeinträchtigen. deinen is the possessive determiner “your” in the masculine singular accusative form. zu beeinträchtigen means “to affect” or, more strongly, “to impair” here. The base verb is beeinträchtigen; zu marks the infinitive after anfangen. The reusable pattern is etwas beeinträchtigt deinen Schlaf — “something affects your sleep.” Together, wenn sich die Schmerzen ausbreiten oder anfangen, deinen Schlaf zu beeinträchtigen means “if the pain spreads or starts affecting your sleep.” oder links the two alternatives. With Das gilt besonders, the whole utterance means “That applies especially if the pain spreads or starts affecting your sleep.”

9. Diese Woche kann ich kleine Änderungen vornehmen und beobachten, ob sie helfen.

   This week, I can make small adjustments and track whether they help.

   Diese Woche

   this week

   kann ich

   I can

   kleine

   small

   Änderungen

   adjustments

   vornehmen

   make; carry out

   beobachten

   observe; monitor

   ob

   whether

   helfen

   help

   More detail

   Diese Woche gives the time frame “this week.” Woche is feminine, and diese is the corresponding form of dies- here. German can use this kind of time expression at the beginning without changing the intended meaning. kann ich means “I can.” kann is the first-person singular present form of können; the infinitive is können – kann. With a modal verb, German places the other verb as an infinitive at the end of the clause: Ich kann Änderungen vornehmen means “I can make adjustments.” kleine describes Änderungen. Its base form is klein; here it has the ending -e because it modifies a plural noun in the accusative without an article. The noun determines the form needed: kleine Änderungen, “small adjustments.” Änderungen means “adjustments” in this sentence. Its base form is Änderung, and the plural is formed with an umlaut and -en: Änderung – Änderungen. The plural form is also the accusative form here, because it is the thing being made or carried out. vornehmen is the separable verb vornehmen, used here in the sense “to make or carry out” an adjustment. Its useful present-tense pattern is ich nehme ... vor, but after kann the infinitive stays together at the end: Ich kann eine Änderung vornehmen — “I can make an adjustment.” beobachten means “to observe or monitor.” It is a regular verb; the infinitive and base form are both beobachten. In this sentence it introduces the process of monitoring the result, which is then specified by the following ob clause. ob introduces an indirect yes/no question and is often translated as “whether” or “if.” It sends the finite verb to the end of its subordinate clause. Compare Ich weiß, ob es hilft — “I know whether it helps.” helfen means “to help” here. The form is helfen, which is both the infinitive and the present-tense form for sie meaning “they.” The pronoun sie refers to the plural Änderungen, so ob sie helfen means “whether they help.” Together, Diese Woche kann ich sets the time and expresses ability, kleine Änderungen vornehmen says what can be done, and beobachten, ob sie helfen says that the speaker will monitor whether those adjustments are effective. The complete meaning is: “This week, I can make small adjustments and track whether they help.”

10. Regelmäßige Änderungen lassen sich normalerweise leichter beurteilen als eine einzige große Änderung.

    Consistent changes are usually easier to judge than one big change.

    Regelmäßige

    consistent; regular

    Änderungen

    changes

    lassen sich

    can be

    normalerweise

    usually

    leichter

    more easily

    beurteilen

    judge; assess

    einzige

    single; only

    große

    big; large

    Änderung

    change

    More detail

    Regelmäßige describes Änderungen here as regular or consistent. It is the plural form of regelmäßig; the ending -e marks agreement with the plural noun in this position. Example: regelmäßige Pausen means “regular breaks.” Änderungen means “changes” or “adjustments.” Its singular base form is die Änderung, and the plural adds -en while retaining the umlaut: die Änderungen. The previous sentence also uses this same noun in kleine Änderungen. lassen sich is a reusable construction with the infinitive that follows it: etwas lässt sich beurteilen means “something can be assessed” or “is possible to assess.” Here lassen is the finite verb and sich is the reflexive element referring to the subject, Änderungen; the construction expresses possibility or ease of performing an action, not permission by a person. Example: Der Fehler lässt sich leicht erklären. — “The error can be explained easily.” normalerweise means “usually” or “normally.” It places the statement in a general pattern rather than making it absolute. Example: Normalerweise arbeite ich morgens. — “I usually work in the morning.” leichter means “more easily” here. It is the comparative form of leicht (“easy” or “easily”): leicht → leichter → am leichtesten. In this sentence, leichter is an adverb modifying beurteilen, and als introduces what the comparison is made with. beurteilen means “to assess” or “to judge.” It is an infinitive after lassen sich; the full pattern is sich leichter beurteilen lassen, “to be easier to assess.” Example: Wir müssen die Ergebnisse sorgfältig beurteilen. — “We have to assess the results carefully.” einzige means “single” or “only one” in the expression eine einzige .... It is the feminine singular form of einzig and agrees with the feminine noun Änderung. Unlike an ordinary indefinite article, einzige adds the idea that there is no second one of that kind here. große means “big” or “large.” It is the feminine singular form of groß in eine ... große Änderung; the adjective has the ending -e because it follows eine and agrees with the feminine singular noun. The comparative is größer (“larger”), but the form in this sentence is the basic adjective, not a comparison. Änderung means “change” or “adjustment” in the singular. It is the singular form of Änderungen and is a feminine noun: die Änderung. In eine einzige große Änderung, the noun phrase refers to one large change, with eine marking an indefinite singular noun phrase and einzige emphasizing that it is a single one. Together, Regelmäßige Änderungen is the plural subject. lassen sich ... beurteilen says that these changes can be assessed, normalerweise leichter says that this is usually easier, and als eine einzige große Änderung supplies the comparison. The whole utterance therefore means: “Consistent changes are usually easier to judge than one big change.”