Complex sentence: The chapter starts with the Seance inside of a television left on by the obese Spaceboy, who is asleep on the couch, and the Seance is trying to tell Spaceboy about what happened to him (being captured and how he will kill him).
Split into simpler sentences: The chapter starts with the Seance inside of a television left on by the obese Spaceboy, who is asleep on the couch. The Seance is trying to tell Spaceboy about what happened to him (being captured and how he will kill him).