Complex sentence: The stadium was constructed in 23 months from 1929 to 1931 after the plans of the Tübingen architect Otto Ernst Schweizer and the second Workers' Olympiad.
Split into simpler sentences: The stadium was constructed in 23 months, from 1929 to 1931. It was built according a design by the Tübingen architect Otto Ernst Schweizer and the second Workers' Olympiad.