Complex sentence: When Eddie goes down to serve another customer Richie sets another trap with Eddie's favourite sandwich pickle onion where the trap door will smash Eddie's head, but the plan backfires again and the hatch shuts, trapping them on the roof.
Split into simpler sentences: When Eddie goes down to serve another customer Richie sets another trap with Eddie's favourite sandwich, pickled onion, where the trap door will smash Eddie's head. The plan backfires again and the hatch shuts, trapping them on the roof.