Complex sentence: During the offseason of 2010 he opted out of his current contract with Salavat Yulaev, seeking a new NHL contract but after failing to do so, he decided to stay with Salavat for another season.
Split into simpler sentences: During the offseason of 2010 he opted out of his contract with Salavat Yulaev seeking a new NHL contract. When he failed to do so, he decided to stay with Salavat for another season.