Complex sentence: In 2016, the Spanish treasury department sent letters to property owners that have not declared income associated with Airbnb, and in Australia, insiders said in 2016 that the hosts of the 75,000 properties listed on Airbnb would likely face increased chances of being audited.
Split into simpler sentences: In 2016, the Spanish treasury department sent letters to property owners that have not declared income associated with Airbnb,. In Australia, insiders said in 2016 that the hosts of the 75,000 properties listed on Airbnb would likely face increased chances of being audited.