Complex sentence: Replacing them were John Lander and Jools Brandt, followed by Larry Himmel, who had also succeeded Shotgun Tom in mornings on B100 back in 1979, But right after Jeff and Jer left B100 ratings for the station began to decline.
Split into simpler sentences: Replacing them were John Lander and Jools Brandt, followed by Larry Himmel, who had also succeeded Shotgun Tom in mornings on B100 back in 1979. After Jeff and Jer left, ratings for the station began to decline.