Complex sentence: This league changed its name to the Major Indoor Lacrosse League, then later to the National Lacrosse League and grew to encompass men's lacrosse clubs in 12 cities throughout the United States and Canada.
Split into simpler sentences: This league changed its name to the Major Indoor Lacrosse League, then later to the National Lacrosse League. It grew to encompass men's lacrosse clubs in 12 cities throughout the United States and Canada.