Complex sentence: Dwight then bursts in with chemicals to spray for bed bugs, and Jim tells him a bug is following Cathy, leading Dwight to chase her from the room, while Jim enjoys her distress.
Split into simpler sentences: Dwight then bursts in with chemicals to spray for bed bugs, and Jim tells him a bug is following Cathy. Dwight proceeds to chase her from the room, while Jim enjoys her distress.