Complex sentence: CKBA began broadcasting in 1988 and it's unknown of what the original format was, however, on September 29,2006, CKBA changed formats from country music to classic hits.
Split into simpler sentences: CKBA began broadcasting in 1988 and it is unknown what the original format was. However, on September 29,2006, CKBA changed formats from country music to classic hits.