Complex sentence: He demands that she finish the job and end his life, but Setsuka merely shows Algol her blade, remarking that her weapon would not want to become an instrument of hatred and then turns her back to him and sheathes it, walking slowly away.
Split into simpler sentences: He demands that she finish the job and end his life, but Setsuka merely shows Algol her blade, remarking that her weapon would not want to become an instrument of hatred. She then turns her back to him and sheathes her weapon, walking slowly away.