Complex sentence: When CHYM and CKGL swaped frequencies, The CKGL Country music format was moved to AM with CKGL, this sucsessful format was changed in 1997 to it's current format of news talk radio.
Split into simpler sentences: When CHYM and CKGL swapped frequencies, the CKGL Country music format was moved to AM with CKGL. This successful format was changed in 1997 to its current format of news talk radio.