Complex sentence: In 1985, Gannett rechristened Channel 11 as WUSA, but after the company purchased WDVM-TV in Washington, D.C., it transferred the call letters to that station.
Split into simpler sentences: In 1985, Gannett rechristened Channel 11 as WUSA. But, after the company purchased WDVM-TV in Washington, D.C., it transferred the call letters to that station.