Complex sentence: At that time WYSO was known as a university-based community radio station, and most significantly several Antioch College students and others involved in the station took it upon themselves to be involved with an incipient community and public radio movement in the United States.
Split into simpler sentences: At that time, WYSO was known as a university-based community radio station. Significantly, several Antioch College students and other volunteers took it upon themselves to be involved with an incipient community and public radio movement in the United States.