Complex sentence: A member of the fushigari (immortal hunters) clan, Kuromaru's mission was to slay Yukihime or never return, but after losing to Tōta, he joins him and Yukihime on their adventures.
Split into simpler sentences: A member of a Fushigari (immortal hunters) clan, Kuromaru's mission was to slay Yukihime or never return. After losing to Tōta, he joins him and Yukihime on their adventures.