Complex sentence: Terry Bean's political involvement is often behind the scenes as a fundraiser, which has assisted in the initial success of several organizations, including the Gay Rights National Lobby and the Gay and Lesbian Victory Fund.
Split into simpler sentences: Terry Bean's political involvement is often behind the scenes as a fund-raiser. His fund-raising prowess has proven vital in the initial success of several organizations such as the Gay Rights National Lobby and the Gay and Lesbian Victory Fund.