Take another look at the sentence:

During the fall semester, parking on campus is very difficult, students circle the lots like vultures, waiting for an empty space, and most students soon realize that taking a 7 a.m. class, despite the effort it takes to get up that early, at least cures their parking woes.

The comma between space and and is correct. Students circle the lots like vultures, waiting for an empty space can stand alone as a complete sentence. Most students soon realize ... begins the next complete sentence. A comma and coordinating conjunction like and is a legal way to join two complete sentences.

Go back to the sentence to try again.

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