Complex sentence: Negan berates Nicholas for doing this and accuses him of being a coward, he asks Rick, Heath or Holly to ask him to kill Nicholas and that if they do so, he will spare them.
Split into simpler sentences: Negan berates Nicholas for doing this and accuses him of being a coward. He asks Rick, Heath, or Holly to ask him to kill Nicholas and says if they do so, he will spare them.