Complex sentence: The Series 2 release in Australia has the original episode-plan of 18 episodes, however the release from the Second half boxset has the aired version of 13 extended episodes (30 minutes).
Split into simpler sentences: The Series 2 release in Australia has the original episode-plan of 18 episodes. However, the release of the Second half boxset has the aired version of 13 extended episodes (30 minutes).