He contributed so much to the game that it was almost as though his play alone led the team to winning it.
こんにちは。
ご質問ありがとうございます。
"He contributed so much to the game that"＝「彼は試合にとても貢献したので、」
（あるいは、"He did so much for the game that"とも言えます。）
"it was almost as though his play alone led the team to winning it."＝「まるで彼が一人でチームを優勝に導いたかのようでした。」
ご参考になると幸いです。
アメリカ合衆国 
