Complex sentence: The Roughriders play in the smallest market in the CFL, and the second-smallest major-league market in North America (only Green Bay, Wisconsin, is smaller).
Split into simpler sentences: The Roughriders play in the smallest market in the CFL, and the second-smallest major-league market in North America. It is also the second-smallest major-league market in North America (only Green Bay, Wisconsin, is smaller).