Complex sentence: More and more killings took place over the next two-years, with the bloodshed best illustrated by the fact that, on a single day-November 30,1982-twelve Mafiosi were murdered in Palermo in twelve separate incidents.
Split into simpler sentences: More and more killings took place over the next two-years. On 30 November 1982, twelve Mafiosi were murdered in Palermo in twelve separate incidents.