Complex sentence: His success continued over to the post-season, where he led the Rangers to an upset over the Philadelphia Flyers in the opening round, then followed it with an upset of a Washington Capitals team that registered 107 points in the regular season.
Split into simpler sentences: His success continued over to the post-season, where he led the Rangers to an upset over the Philadelphia Flyers in the opening round. He then followed it with an upset of a Washington Capitals team that registered 107 points in the regular season.