Complex sentence: Petrosian, who drew his last 5 games of the tournament, emerged as the winner on 17.5 points out of 27, half a point ahead of Keres and Geller.
Split into simpler sentences: Petrosian, who drew his last 5 games of the tournament, emerged as the winner. Petrosian scored 17.5 points out of 27, half a point ahead of Keres and Geller.