Complex sentence: Otis would later follow, and was saved from zombies surrounding the prison by the newly-arrived Michonne and joined the group (though ended his relationship with Patricia after learning of her part in Dexter's attempted coup).
Split into simpler sentences: Otis would later follow, and was saved from zombies by the newly-arrived Michonne. He rejoins the group (though ended his relationship with Patricia after learning of her part in Dexter's attempted coup).