Complex sentence: It doubled from US $1.5 million in August 2005 to $3 million in November 2005, and a notable donation was made in September 18,2006 when PayPal founder Peter Thiel pledged $3.5 million to the Methuselah Foundation's research programs.
Split into simpler sentences: It doubled from US $1.5 million in August 2005 to $3 million in November 2005. A notable donation was made in September 18,2006 when PayPal founder Peter Thiel pledged $3.5 million to the Methuselah Foundation's research programs.