Complex sentence: Yusuke runs off realizing that the true monster is not the woman Misako has turned into or women in general; instead, the true monster is himself, the creator of the beast Misako has become.
Split into simpler sentences: Yusuke runs off realizing that the true monster is not the woman Misako has turned into or women in general. Instead, the true monster is himself, the creator of the beast Misako has become.