Complex sentence: The Lord Commander, Staffa Kar Therma a.k.a. The Star Butcher, is a mercenary who leads an elite group of soldiers (the Companions) and he has aligned himself to The Seddi Order, former quasi-religious group in effort to stop humanity from making itself extinct.
Split into simpler sentences: The Lord Commander, Staffa Kar Therma a.k.a. The Star Butcher, is a mercenary who leads an elite group of soldiers (the Companions). He has aligned himself to The Seddi Order, a former quasi-religious group in an effort to stop humanity from making itself extinct.