Complex sentence: Shivers continues his mission of trying to rid himself of his schizophrenia through Lynn, axing her boss, abducting Nicholas after dismembering his babysitter, and breaking into the theatre, where he butchers two employees.
Split into simpler sentences: Shivers continues his mission of trying to rid himself of his schizophrenia through Lynn. He kills her boss, abducts Nicholas after dismembering his babysitter, and breaks into the theatre, where he butchers two employees.