Complex sentence: In one instance, Lobo was declared immortal; after he died and went to hell, he proved too much for the demons, and when he was then sent to heaven, he wreaked so much havoc that he was permanently banished from the afterlife.
Split into simpler sentences: In one instance, Lobo was declared immortal as after he died and went to hell, he proved too much for the demons of hell and when he was sent to heaven instead. Lobo has wreaked so much havoc that he was permanently banished from the afterlife.