Complex sentence: Bart then says he can get back to his regular dreams, him and Krusty winning the Super Bowl, but Willie turns into a giant bagpipe spider and is about to kill Bart when Lisa enters, trying to wake him up.
Split into simpler sentences: Bart then says he can get back to his regular dreams, him and Krusty winning the Super Bowl. But Willie turns into a bagpipe spider and is about to kill Bart when Lisa enters, trying to wake him up.