Complex sentence: The Australian Football League's 2009 finals series determined the top eight final positions of the 2009 AFL season over four weekends in September 2009, culminating with the 113th AFL Grand Final at the Melbourne Cricket Ground on 26 September 2009.
Split into simpler sentences: The Australian Football League's 2009 finals series will determine the top eight final positions of the 2009 AFL season. It began on the weekend of 4 September 2009 and will end with the 113th AFL Grand Final at the Melbourne Cricket Ground on 26 September 2009.