Complex sentence: The 2nd World Internet Conference (WIC)-Wuzhen Summit, held from Dec.16 to 18,2015, got together more than 2000 representatives from over 120 countries and regions and over 20 international organizations.
Split into simpler sentences: The 2nd World Internet Conference (WIC)-Wuzhen Summit, held from Dec.16 to 18,2015. And it got together more than 2000 representatives from over 120 countries and regions and over 20 international organizations.