Complex sentence: The Rudd Government, with effect from 1 from July 2012, increased the surcharge threshold amount at which the 1% surcharge applies to individuals with "income for MLS purposes" above $90,000, or $180,000 for families.
Split into simpler sentences: The Rudd Government, with effect from 1 from July 2012, changed the basis of the surcharge threshold to "income for MLS purposes". The threshold "income for MLS purposes" amount at which the 1% surcharge applied was $90,000 for individuals or $180,000 for families.