Complex sentence: The business was very successful and the Wertheim family achieved celebrity status in Australia during the 1920s, however after the 1929 depression and with declining demand for pianos, the factory closed in 1935.
Split into simpler sentences: The business was very successful and the Wertheim family achieved celebrity status in Australia during the 1920s. However after the 1929 Great Depression and with declining demand for pianos, the factory closed in 1935.