Complex sentence: In Australia, the first series was broadcast on the Seven Network beginning on 29 May 2011; the second series was broadcast beginning on 20 May 2012; and the third series beginning on 10 February 2013.
Split into simpler sentences: In Australia, the first series was broadcast on the Seven Network from 29 May 2011. The third series was broadcast on the Seven Network from 10 February 2013.