This is an example of a short GMAT question that involves a descriptive phrase. So you should be applying Framework #3: Descriptive Phrase, Main Sentence?
How do you know you should be applying this framework?
Because the sentence is structured in the way the name of the framework suggests. First you see a descriptive phrase. Then you see a comma. Then you see the main part of the sentence.
So in this case you can break it down into the following:
Descriptive phrase: "Trying to find the reason for a discrepancy in the records"
Main sentence: "he found that the files had been tampered with"
Note that the descriptive phrase in this case begins with a verb ending in -ING--in this case "Trying." What do we know about descriptive phrases that end in -ING? Well, you'll learn about this strategy in core framework #3 of the GMAT Pill for Sentence Correction!
source: GMAT Pill*
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