YOU SAID:

the children were very happy when they won their game

INTO JAPANESE

ゲームに勝ったとき、子供たちはとても幸せでした

BACK INTO ENGLISH

The kids were very happy when they won the game

INTO JAPANESE

彼らがゲームに勝ったとき、子供たちはとても幸せでした

BACK INTO ENGLISH

The kids were very happy when they won the game