Complex sentence: The next night, Homer and Bart wait at the overpass, and when the mystery person arrives, Bart tries to jump on the stranger, but the stranger sidesteps and slips a "World's Best Grandson" sweater over Bart's head.
Split into simpler sentences: The next night, Homer and Bart wait at the overpass. When the mystery person arrives, Bart tries to jump on the stranger, who sidesteps and slips a "World's Best Grandson" sweater over Bart's head.