Complex sentence: A 1974 film version of the musical starring Lucille Ball, Bea Arthur as Vera and Robert Preston as Beauregard, attracted an audience but was considered disappointing by the critics because Lucille Ball was considered not up to the musical demands of the title role.
Split into simpler sentences: A 1974 film version of the musical starred Lucille Ball, Bea Arthur as Vera and Robert Preston as Beauregard. Although it attracted an audience it was considered disappointing by the critics because Lucille Ball was considered not up to the musical demands of the title role.