Complex sentence: The run was not staged again until 1927, and then annually run from 1927 until the onset of World War II. Due to petrol rationing, the race was canelled for 1947.
Split into simpler sentences: The run was not staged again until 1927, and then annually run from 1927 until the onset of the Second World War. Owing to petrol rationing, the race was cancelled for 1947.