Complex sentence: Gary Gunnar Bergman (October 7,1938 in Kenora, Ontario--December 8,2000) was a professional ice hockey defenceman playing in the NHL mostly for the Detroit Red Wings.
Split into simpler sentences: Gary Gunnar Bergman (October 7,1938 in Kenora, Ontario--December 8,2000) was a Canadian professional ice hockey player. A defenceman, Berman played in the NHL, mostly for the Detroit Red Wings.