Complex sentence: On July 18,2011, Mackowycz announced that he would be leaving the CBC following the July 25 edition of "Radio 2 Morning" and was succeeded as host of "Radio 2 Morning" by Tom Power.
Split into simpler sentences: On July 18,2011, Mackowycz announced that he would be leaving the CBC following the July 25 edition of "Radio 2 Morning". He was succeeded as host of "Radio 2 Morning" by Tom Power.