Could you refine this sentence for me?

[shajuju]

Hi, gays. I has write a sentence. I think maybe there is some wrong with the it. Could you understant it? If not, could you polish it for me?
Here is:
His faith is to try to apply polymer science to real world. When I saw he contributing to the progress of technology in society and boosting its profit margin of manufacturer, I realized chemistry would only become useful when its application could be realized.

[Tdol]

How about:
When I saw him contribute to the progress of technology in society and boost manufacturers' profit margins, I realized chemistry would only become useful when its application could be realized. (this is unclear to me- what do you want to say here?)