Complex sentence: In the late 2000s, housing prices in Australia, relative to average incomes, were among the highest in the world, prompting speculation that the country was experiencing a real estate bubble, like many other countries.
Split into simpler sentences: In the late 2000s, housing prices in Australia, relative to average incomes, were among the highest in the world. This prompted speculation that the country was experiencing a real estate bubble, like many other countries.