Complex sentence: In 2010, the North Stars returned to Île-des-Chênes and attempted to qualify for the 2011 Allan Cup, but lost to their local rivals, the South East Prairie Thunder, in the provincial playdowns.
Split into simpler sentences: In 2010, the North Stars hockey club returned to Île-des-Chênes. They attempted to qualify for the 2011 Allan Cup tournament, but lost to their local rivals, the South East Prairie Thunder, in the provincial playdowns.