Complex sentence: Premium "Dota 2" tournaments often have prize pools totaling millions of dollars, the highest of any eSport, with the largest of them being known as The International, which is hosted by Valve and takes place annually at the KeyArena in Seattle.
Split into simpler sentences: Premium "Dota 2" tournaments often have prize pools totaling millions of dollars, the highest of any eSport. The largest of them is known as The International, which is hosted by Valve and takes place annually at the KeyArena in Seattle.