Complex sentence: The aggregate wealth of the first 40 pledgers was $125 billion as of August 2010 and as of April 2011,69 billionaires had joined the campaign and given a pledge.
Split into simpler sentences: The aggregate wealth of the first 40 pledgers was $125 billion as of August 2010. As of April 2011,69 billionaires had joined the campaign and given a pledge.