We had hoped to give you a chance such as nobody else ever had. 我们本来希望给你一个别人从未有过的机会。

Then I left it，feeling a weight at my heart such as I had never had before. 然后我离开那里，心头感到一种前所未有的沉重心情。

回答如下：

以上为关系代词AS 引导的定于从句

We had hoped to give you a chance such as nobody else ever had.

原后应该是下面句子结构

We had hoped to give you such a chance  as nobody else ever had.

结构为：(such+名词+关系代词as+主语+谓语)

（备注：被such修饰/限定先行词，需要有关系代词AS 引导定语从句）