Complex sentence: The department heads strongly opposed this option and claimed this kind of radio station, a "programless" station, had no chance of succeeding, and many of them threatened to resign if such a station was to be opened.
Split into simpler sentences: The department heads strongly opposed this option and claimed this kind of radio station, a "programless" station, had no chance of succeeding. Many of them threatened to resign if such a station was to be opened.