Take another look at the sentence:

Mark looked under the bed, in the hamper, and he even searched his brother’s closet, but he could not find his favorite University of Florida T-shirt.

When you list grammatical items, you must use parallel structure. Here, under the bed and in the hamper are both prepositional phrases, but he even searched ... is a main clause, wrecking the parallelism.

To fix the sentence, change he even searched his brother's closet to in his brother's closet.

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