Complex sentence: If Burgess kills Anderton, he will be imprisoned for life, but PreCrime will live on; if he spares Anderton, the PreCrime system will be discredited and shut down.
Split into simpler sentences: If Burgess kills Anderton, he will be imprisoned for life, but PreCrime will live on. If he spares Anderton, the PreCrime system will be discredited and shut down.