Complex sentence: The first edition was held in Doha, Qatar from November 16 th to 18 th 2009, the second from December 7 th to 9 th 2010.
Split into simpler sentences: The first edition was held in Doha, Qatar from November 16 th to 18 th 2009. The second edition was held in Doha from December 7 th to 9 th 2010.