Complex sentence: Robert Félix Lemieux (October 9th, 1941--January 21st, 2008) was a radical lawyer who served as an intermediary for the FLQ cells and Canadian authorities during the October Crisis.
Split into simpler sentences: Robert Félix Lemieux (October 9th, 1941--January 21st, 2008) was a radical Canadian lawyer. He served as an intermediary for the Front de liberation du Quebec cells and Canadian authorities during the October Crisis.