Complex sentence: Since 2012 Stiglitz has been the President of the International Economic Association and is currently presiding over the organization of the IEA triennial world congress that will be held on the Dead Sea Jordan in June 2014.
Split into simpler sentences: Since 2012 Stiglitz has been the president of the International Economic Association. He presided over the organization of the IEA triennial world congress held near the Dead Sea in Jordan in June 2014.