Complex sentence: However, when he tries to call home using his Ladybug phone, the phone rejects his call, and then he inadvertently calls 911 and the police arrive, almost leading to the arrest of Rowley's father, and Greg is then exposed and sent home.
Split into simpler sentences: However, when he tries to call home using his Ladybug phone, the phone rejects his call. Then he inadvertently calls 911 and the police arrive, almost leading to the arrest of Rowley's father, and Greg is then exposed and sent home.