Complex sentence: Hall did so, with a new band of his own despite the efforts business at the Uptown Café Society worsened and Barney Josephson closed Uptown for good in December 1947.
Split into simpler sentences: Hall did so, with a new band of his own. Despite the efforts business at the Uptown Café Society worsened and Barney Josephson closed Uptown for good in December 1947.