Complex sentence: When the third division became defunct in 1952, Aldershot joined the Southern League for a year and then the stadium was used for open meetings and Southern Area League events until 1960, when after a short season of open meetings, the track closed.
Split into simpler sentences: When the third division became defunct in 1952, Aldershot joined the Southern League for a year and then the stadium was used for open meetings and Southern Area League events. In 1960, after a short season of open meetings, the track closed.