Complex sentence: Eventually, they manage to skip from class and escape from school, after lying to the science teacher that they are going to the bathroom, and after spitting on Principal McVicker from the school rooftop, causing him to leave the school entrance.
Split into simpler sentences: Eventually, they manage to skip from class after lying to the science teacher that they are going to the bathroom. They manage to slip from school after spitting on Principal McVicker from the school rooftop, causing him to leave the school entrance.