Complex sentence: From 2003 to 2007, Canwest operated a radio station in Winnipeg, CoolFM, which served as an adjunct to CoolTV; the radio station was sold to Corus Entertainment in 2007 and rebranded "Groove FM".
Split into simpler sentences: From 2003 to 2007, Canwest operated a radio station in Winnipeg, CoolFM, which served as an adjunct to CoolTV. The radio station was sold to Corus Entertainment in 2007 and rebranded "Groove FM".