Complex sentence: Seiryo is a teacher at the GP academy who is prejudiced against Earthlings, in particular Seina Yamada; his hatred of Earthlings could be tied to his loss to Tenchi in a duel for Ayeka.
Split into simpler sentences: Seiryo is a teacher at the GP academy who is prejudiced against Earthlings, in particular Seina Yamada. His hatred of Earthlings could be tied to his loss to Tenchi in a duel for Ayeka.