Complex sentence: In his early years, he displays several psychopathic tendencies such as mutilating his toys and killing stray animals, although this behavior seems to be less prevalent as he ages, and he begins to show concern for Frank.
Split into simpler sentences: In his early years, he displays several psychopathic tendencies such as mutilating his toys and killing stray animals. Although this behavior seems to be less prevalent as he ages, and he begins to show concern for Frank.