Complex sentence: Doc informs Baby his debt is paid, and instructs him to get rid of a car carrying the corpse of one of the robbers, who was killed for being careless and leaving behind a shotgun.
Split into simpler sentences: Doc informs Baby his debt is paid, and he instructs Baby to get rid of a car carrying a corpse. The body is of one of the robbers who was killed for being careless and leaving behind a shotgun.