Complex sentence: The bullying stopped when Manson associated herself with a rebel crowd--which resulted in her rebelling herself; playing truant for most of her final year at school, smoking cannabis and sniffing glue, drinking, shoplifting, and on one occasion breaking into Edinburgh Zoo.
Split into simpler sentences: The bullying stopped when Manson associated herself with a rebel crowd, which resulted in her rebelling herself. She was absent for most of her final year at school and began smoking cannabis, sniffing glue, drinking alcohol, shoplifting, and on one occasion breaking into Edinburgh Zoo.