Complex sentence: The lecture was, in fact, a happening which consisted of a number of short stories read by Cage in exactly one minute; because of this time limit the speed of Cage's delivery varied enormously.
Split into simpler sentences: The lecture was, in fact, a happening. It consisted of a number of short stories, and in their reading by Cage, each was allotted exactly one minute-and, consequently, the speed of talking varied enormously.