Complex sentence: Prior to the 1977 referendum residents within Australia's territories did not vote at referendums, however since this date residents of territories are counted, but only towards the national total and are not counted against any of the states.
Split into simpler sentences: Prior to the 1977 referendum residents within Australia's territories did not vote at referendums. However since this referendum was approved residents of territories are counted, but only towards the national total and not against the totals of any of the states.