Complex sentence: He displays little to no affection or moral responsibility towards his family or community; indeed, Kevin seems to regard everyone with contempt and hatred, and reserves special loathing for his mother, whom he has antagonized for as long as he can remember.
Split into simpler sentences: He displays little to no affection or moral responsibility towards his family or community; indeed, Kevin seems to regard everyone with contempt and hatred. He reserves special loathing for his mother, whom he has antagonized for as long as he can remember.