Review the item:
Belinda hates her psychology class, although her professor is an interesting
lecturer,
the auitorium is right next to the copy center, and the whump, whump,
whump of the machines always makes Belinda drowsy.
The comma between lecturer and the is correct. Although her professor is an interesting lecturer is a subordinate clause. The auditorium is right next to the copy center is a main clause.
When a subordinate clause introduces a main clause, you need a comma between them.