Complex sentence: However, Jerry manages to sneak in by going under the car when it stops in a driveway, coming in from an opening in the floor of the trunk then kicks Tom out of the car, causing Tom's head to skid along the road.
Split into simpler sentences: However, Jerry manages to sneak in by going under the car when it stops in the driveway, coming in from an opening in the floor of the trunk. Then Jerry kicks Tom out of the car, causing Tom's head to skid along the road.