If you want something you've never had, you must be willing to do something you've never d

If you want something you've never had, you must be willing to do something you've never done.

If you want something you‘ve never had条件状语从句
其中 主语 you 谓语 want 宾语 something 定语（从句）you've never had
you must be willing to do something you‘ve never done 主句
其中 主语 you 谓语must be willing to do 宾语 something 定语（从句）you‘ve never done
两个定语从句都省略了关系词that
如果你想得到你从未得到的东西,你就必须愿意做你从未做过的事情

If you want something you've never had, you must be willing to do something you've never done. 如果你想要你从未有过的东西，你必须愿意去做一些你从未做过的事情。

如果你想要你从未有过的东西，你就必须去做你从未做过的事情。 应该是这个意思