Complex sentence: Above and below the line voting would be Optional Preferential, with voters told to write at least their first six preferences, however a "savings provision" would be put in place if less than six were given.
Split into simpler sentences: Above and below the line voting would be Optional Preferential. For above the line, voters will be told to write at least their first six preferences, however a "savings provision" would be put in place if less than six were given.