Complex sentence: In addition, in episode eleven, "Redemption," the group encounters a genetically enhanced killer called Z.E.D., that has been left on the planet, disposing of humans he finds (the assumption being they are criminals).
Split into simpler sentences: In addition, episode eleven, "Redemption," has the group encounter a genetically enhanced killer called Z.E.D., that has been left on the planet. His presence is used to dispose of humans he finds (the assumption being they are criminals).