Complex sentence: The former on-campus venue, the Black Box Theatre, was painted and floored entirely white, serving as a dance room until fall 2015, where the black box theatre returned to OCSA and has been renamed the Studio Theatre.
Split into simpler sentences: The former on-campus venue, the Black Box Theatre, is now painted and floored entirely white, which serves as a dance room. As of fall 2015, the black box theatre returned to OCSA and has been renamed the Studio Theatre.