Complex sentence: Following his release from St. Elizabeth's, he reconnected with Greenlee and some other muscians and they recorded songs that found an audience on underground stations in the Washington area, such as WGTB, the Georgetown University station, and WHFS, which was based in Bethesda.
Split into simpler sentences: Following his release from St. Elizabeth's, he reconnected with Greenlee and some other musicians. They recorded songs that found an audience on underground stations in the Washington area, such as WGTB, the Georgetown University station, and WHFS, which was based in Bethesda.