Complex sentence: Murphy's main accomplices on both occasions were Moore and Bates, while Edwards was party to the killing of Quinn and another man and two women, whom Dillon did not name, were accessories to the murder of Rice.
Split into simpler sentences: Murphy's main accomplices on both occasions were Moore and Bates, while Edwards was party to the killing of Quinn. Another man and two women, whom Dillon did not name, were accessories to Murphy in the murder of Rice.