Complex sentence: Guylaine Cloutier (born October 1,1971) is a former international breaststroke swimmer from Canada, who competed for her native country at three consecutive Summer Olympics, starting in 1988.
Split into simpler sentences: Guylaine Cloutier (born October 1,1971) is a former competition swimmer from Canada, who was a breaststroke specialist. Cloutier competed internationally at three consecutive Summer Olympics, starting in 1988.