Original sentence: Before the emergence of the Soviet Union, Canada dominated hockey, winning six out of seven golds at the olympics before 1954 and 13 world championship gold medals before 1961.Canada has been one of the most dominant hockey teams in international play, winning the 1972 Summit Series against the Soviet Union, four of five Canada Cups dating back to 1976 and winning in the 2002 Winter Olympics, two recent International Ice Hockey Federation World Championships, as well as the 2004 World Cup of Hockey.However, Canada was able to win only four World Championships and no Winter Olympic Gold medals between 1954 and 1991 when the Soviet national ice hockey team, Czechoslovakian national ice hockey team, and Swedish national ice hockey team dominated.Prior to 1977, professionals were not allowed to play in these events
Edited sentence: Before the emergence of the Soviet Union, Canada dominated hockey even more so than it does today, winning six out of seven golds at the olympics  before 1954 and 13 world championship gold medals before 1961.Canada has been one of the most dominant hockey teams in international play (the most dominant nowadays), winning the 1972 Summit Series against the Soviet Union, four of five Canada Cups dating back to 1976 and winning in the 2002 Winter Olympics, the last two International Ice Hockey Federation World Championships, as well as the 2004 World Cup of Hockey.However, Canada was able to win only four World Championships and no Winter Olympic Gold medals between 1954 and 1991 when Soviet national ice hockey team and the Czechoslovakian national ice hockey team dominated.Prior to 1977, professionals were not even allowed to play in these events