his hard work / when he won the prize.a:paid off; 请分析句型?

His hard work was paid off when he won the prize. 被动句型。

句型就是：
当他获奖的时候，他的努力工作获得了回报。

题目不是很清楚,你可否说明一下
主语是his hard work paid off ,他的努力工作得到了回报,后面的when引导的是时间状语从句
paid off在这里是成功,取得好结果的意思