Complex sentence: August, Carlsen won the Biel Grandmaster Tournament with a +2 record and a performance rating of 2753; his score was equalled by Alexander Onischuk, and thus they played a match to determine the winner.
Split into simpler sentences: August, Carlsen won the Biel Grandmaster Tournament with a +2 record and a PR of 2753. His score was equalled by Alexander Onischuk, and thus they played a match to determine the winner.