Complex sentence: Since 2006 members have been elected using the single transferable vote system of proportional representation, making it easier for minor parties to gain election and possibly gain the balance of power, as opposed to majority control by a single major party.
Split into simpler sentences: Since 2006 members have been elected using the single transferable vote system of proportional representation. The reforms have made it easier for minor parties to gain election to the chamber and possibly gain the balance of power, as opposed to majority control by a single major party.