Complex sentence: Daryl Kenneth "Doc" Seaman (28 April 1922--11 January 2009) was a Canadian oilman who from 1949 to 1994 was the head of the Calgary-based company Bow Valley Industries.
Split into simpler sentences: Daryl Kenneth "Doc" Seaman, (28 April 1922--11 January 2009) was a Canadian oilman. From 1949 to 1994 he was the head of the Calgary-based company Bow Valley Industries.