Complex sentence: The site had previously been used for the large First World War "Bath War Hospital" from 1916 to 1922, then renamed the "Bath Ministry of Pensions Hospital" until closed in 1929.
Split into simpler sentences: The site had previously been used for the large First World War "Bath War Hospital" from 1916 to 1922. By 1920 it had been renamed the "Bath Ministry of Pensions Hospital", which it remained until it closed in 1929.