Complex sentence: They won the Stanley Cup in 1917, becoming the first American team to do so, by defeating the National Hockey Association's Montreal Canadiens three games to one by a combined score of 19 to 3.
Split into simpler sentences: They won the Stanley Cup in 1917, becoming the first American team to do so. Seattle won the 1917 by defeating the National Hockey Association's Montreal Canadiens three games to one by a combined score of 19 to 3.