Complex sentence: They lose them in the swamp but run into the Orthinotch, an evil monster who helps heal them an saves Archie's life and leads them away before being killed by the Verdant Company.
Split into simpler sentences: They lose them in the swamp but run into the Orthimoch, an evil monster who helps heal them and saves Archie's life. He leads them away before being killed by the Verdant Company.