Here is the sentence again:

Davina, a good friend from my biology class, has more interest in what is under a guy's skin than what is under his clothes, for this reason, she is pursuing a degree in radiography.

The comma between clothes and for is making a comma splice. At this spot, there are two complete sentences joined only with a wimpy comma. Davina, a good friend of mine, has more interest ... begins the first complete sentence. For this reason, she is pursuing a degree in radiography is the second complete sentence.

To fix this problem, you could put a period after clothes and capitalize the F in for.

Go to the next sentence.

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