Complex sentence: The two 3 hour sprints were later replaced with a single 6 hour race and a 9 hour race was trialled in 2009 in race 2 again at Victoria Park.
Split into simpler sentences: The two 3 hour sprints were then replaced with a single 6 hour race. A 9 hour race was trialled once during 2009 in race 2 again at Victoria Park.