Complex sentence: In the late 1990s WDOW (by then an AM/FM station) was sold, and by 2012 WDOW-AM and WDOW-FM had different owners.
Split into simpler sentences: In the late 1990s WDOW (by then an AM/FM station) was sold. Fast forward to 2012 WDOW-AM and WDOW-FM had different owners.