看看这句话如何 有错误吗?句子好吗?

应该没有什么问题了。dedicate to working和介词for都没有问题

他把自己最宝贵的青春献给的这座工厂是5年前建立起来的。

The company for which he had dedicated his golden period of youth to working was founded 5 years ago.
==>The company where he had dedicated his golden period of youth to was founded 5 years ago.
这里加work,与不加没多大影响,从dedicate可以看出