Complex sentence: Johnson used the building to host other community events, meetings and other gatherings, including "Broadway Cares" benefits for AIDS/HIV research and treatment that featured live performances by cast members of "Angels in America" and other shows visiting the Kennedy Center.
Split into simpler sentences: Johnson used the building to host other community events, meetings and other gatherings. These included "Broadway Cares" benefits for AIDS/HIV research and treatment that featured live performances by cast members of "Angels in America" and other shows visiting the Kennedy Center.