Complex sentence: Shortly after Davis joined Daynard,'Don and Erin' became the top rated morning show in the market and maintained high ratings through 1999, when Don Daynard retired and was replaced by Bob Magee as Davis's co-host in the mornings.
Split into simpler sentences: Shortly after Davis joined Daynard,'Don and Erin' became the top rated morning show in the market. Together, Don and Erin maintained high ratings through 1999, when Don Daynard retired and was replaced by Bob Magee as Davis's co-host in the mornings.