Complex sentence: In September 2011, Ellison was listed on the "Forbes" list of billionaires as the fifth richest man in the world and was still the third richest American, with a net worth of about $36.5 billion.
Split into simpler sentences: In September 2011, Ellison was listed on the Forbes List of Billionaires as the fifth richest man in the world. Ellison is still the third richest American, with a net worth of about $36.5 billion.