Here is a practice sentence from Martha Kolln's Rhetorical Grammar:
"The lectures in our astronomy class as well as the assigned reading and the lab work make it clear that I am in the wrong class I have decided to drop the course."
I believe that only a colon or semicolon is needed between class and I. My colleagues in the English department, however, have all punctuated the sentence this way:
"The lectures in our astronomy class, as well as the assigned reading and the lab work, make it clear that I am in the wrong class; I have decided to drop the course."