Complex sentence: His father followed professional boxing as an avid fan, and by the time Ohba was in elementary school, he dreamt of becoming a world champion, and bringing himself and his family out of poverty.
Split into simpler sentences: His father followed professional boxing as an avid fan which influenced Ohba's childhood aspirations and dreams. By the time Ohba was in elementary school, he dreamt of becoming a world champion, and bringing himself and his family out of poverty.