Simplify the following text for a Grade 12 native English-speaking person.
Original: Keith Magnuson ( April 27 , 1947 in Saskatoon , Saskatchewan - December 15 , 2003 in Vaughan , Ontario ) was a Canadian professional ice hockey defenceman who was the captain of the Chicago Blackhawks from 1976 to 1979 .
Simplified: Keith Arlen Magnuson ( April 27 , 1947 -- December 15 , 2003 ) was a professional ice hockey defenceman from Saskatoon , Saskatchewan who played in the National Hockey League ( NHL ) between 1969 and 1979 .