Complex sentence: As of 2013, daytimers only exist in the United States; the last Canadian daytime station, CKOT, signed off on February 17 of that year after converting to the FM band.
Split into simpler sentences: As of 2013, daytime stations only exist in the United States. The last Canadian daytime station, CKOT, signed off on February 17 of that year after converting to the FM band.