Complex sentence: One of the legendary San'Yuan Warriors, Professor Seidatsu, runs a school here.They were wiped out by the Byakko clan in order to steal their sacred sword they were defeated due to their weakness to metal chi.
Split into simpler sentences: One of the legendary San'Yuan Warriors, Professor Seidatsu, runs a school here. The clan was wiped out by the Byakko clan in order to steal their sacred sword they were defeated due to their weakness to metal chi.