Complex sentence: Tencent is one of the largest Internet companies, as well as the largest gaming company in the world, many services of whose include social network, web portals, e-commerce, mobile games and multiplayer online games.
Split into simpler sentences: Tencent is one of the largest Internet companies, as well as the largest gaming company in the world. It's many services include social network, web portals, e-commerce, mobile games and multiplayer online games.