Complex sentence: CKXT-DT was a broadcast television station based in Toronto, Ontario, Canada and serving much of southern and eastern Ontario, owned by Quebecor Media through its Groupe TVA unit.
Split into simpler sentences: CKXT-DT was a broadcast television station based in Toronto, Ontario, Canada that broadcasted to much of southern and eastern Ontario. It was owned by Quebecor Media through its Groupe TVA unit.