Complex sentence: Tatsuya eventually defeats 9 other fighters and faces his father in the final match and emerges victorious and seeks the truth behind the incident so Tsutsui can be arrested for his involvement in the murders.
Split into simpler sentences: Tatsuya eventually defeats 9 other fighters and faces his father in the final match and emerges victorious. He then seeks the truth behind the incident so Tsutsui can be arrested for his involvement in the murders.