Complex sentence: Donahue's career started 1949 on the east coast of the U.S. at WTIP in South Carolina and continuing at WIBG in Philadelphia and WINX in Maryland, before moving to San Francisco in 1961 after the payola scandal involving Alan Freed and Dick Clark.
Split into simpler sentences: Donahue's career started in 1949 on the east coast of the U.S. at WTIP in South Carolina and contined at WIBG in Philadelphia and WINX in Maryland. He moved to San Francisco in 1961 after the payola scandal involving Alan Freed and Dick Clark.