Complex sentence: John Tabatabai is a British poker player based in London, England, who was the runner-up to Norwegian poker player Annette Obrestad in the first World Series of Poker Europe Main Event.
Split into simpler sentences: John Tabatabai is a British poker player based in London, England. He was the runner-up to Norwegian poker player Annette Obrestad in the first World Series of Poker Europe Main Event.