Complex sentence: Mitsuo begins by rescuing people who are victims of crimes or disasters, so as Perman he is admired; but is often troubled by his dual life as a both brilliant superhero and an unrewarded ordinary boy.
Split into simpler sentences: Mitsuo begins by rescuing people who are victims of crimes or disasters, so as Perman he is admired. He is, however, often troubled by his dual life as a both brilliant superhero and as an unrewarded ordinary boy.