Complex sentence: For most of its history the race has been held at Hamburg, but it has also been staged at Grunewald (1919), Hoppegarten (1943--44), Munich (1946) and Cologne (1947).
Split into simpler sentences: For most of its history the race has been held at Hamburg. It has also been staged at Grunewald (1919), Hoppegarten (1943--44), Munich (1946) and Cologne (1947).