Complex sentence: Francis Simard, of Montreal, Quebec, was a member of the Chenier cell of the terrorist group, the Front de Libération du Quebec (FLQ) who were responsible for the events known as the October Crisis.
Split into simpler sentences: Francis Simard, of Montreal, Quebec, was a member of the Chenier cell of the terrorist group, the Front de Libération du Quebec (FLQ). Members of the terrorist group were responsible for the events known as the October Crisis.