Complex sentence: He also attempts to contact Clara, to no response; at her apartment complex, she investigates a boy's claims of his parents' disappearance, seemingly to be confronted with an abusive home environment.
Split into simpler sentences: He also attempts to contact Clara, to no response. At Clara's apartment complex, Clara finds a young boy, saying he can't find his parents and investigates the boy's claims, seemingly to be confronted with an abusive home environment.