Using the preposition For to indicate a purpose

I am curious to know if the usage of "for" in the sentence below is grammatical?

The reason why “socioeconomical understanding” is chosen as the umbrella section is for it to mediate the understanding of innovation in X industries. The following subsections are intertwined in their individual evolutions and implications for X industries.

PS: I am aware that there is a split among linguists concerning the usage of "The reason why". By extension, I am open to suggestions regarding reconstructing the paragraph.

Your usage of 'for' is acceptable as Kate commented. I'm sure the reason you are asking is because it sounds a little clunky. This is what I would do to simplify it.

The umbrella section “socioeconomical understanding” was chosen to mediate the understanding of innovation in X industries. The following subsections are intertwined in their individual evolutions and implications for X industries.

Hopefully this puts you on the path to a final structure.