Complex sentence: WVAB had been a pop and rock music station, relying on a series of itinerant disc jockeys to purvey their various musical tastes to a limited local audience until advertising revenues trickled to a halt at the end of the 1980s.
Split into simpler sentences: WVAB had been a pop and rock music station, relying on a series of itinerant disc jockeys to purvey their various musical tastes to a limited local audience. Eventually, advertising revenues trickled to a halt at the end of the 1980s.