Here is the sentence again:
Belinda hates her psychology class, although
her professor is an interesting lecturer, the auditorium is right next to
the copy center, and the whump, whump, whump of the machines always makes
Belinda drowsy.
The comma between class and although creates a comma splice. At this spot, there are two complete sentences joined with a comma alone, making a major sentence error. Belinda hates her psychology class is the first complete sentence. Although her professor is an interesting lecturer, the auditorium is ... begins the next complete sentence.
To fix this problem, you could put a period after class and capitalize the A for although.