Complex sentence: Just before he can kill the child, Piper is able to recover the Godkiller from the accountant and tries to shoot Jonah, she misses and then the gun lands next to the altar.
Split into simpler sentences: Just before he can kill the child, Piper is able to recover the Godkiller from the accountant and tries to shoot Jonah. She misses and then the gun lands next to the altar.