Complex sentence: After driving them far into the Australian outback where they stop for a picnic, their father suddenly begins shooting at them; when they run behind rocks for cover, he sets the car on fire and shoots himself in the head.
Split into simpler sentences: After driving them far into the Australian outback for a picnic, the father suddenly begins shooting at his children. When they run behind rocks for cover, he sets the car on fire and shoots himself in the head.