Complex sentence: He retired in 2010, but returned to radio and TV on August 17,2015, this time on WMMJ (a Radio One station based in D.C.) to host "The Donnie Simpson Show".
Split into simpler sentences: He retired in 2010, but returned to radio and TV in 2015. On August 17,2015, Donnie Simpson came out of retirement and returned to the radio airwaves, this time on WMMJ (a Radio One station based in D.C.) to host "The Donnie Simpson Show".