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Parallax scroll in two directions question

This parallax is melting my brain!
I’m getting so confused here. I thought this effect would be relatively straight forward but I’ve got myself in a muddle. I’m trying to achieve something similar to this example where the left half of the screen scrolls up and the right half scrolls down. Can anyone offer any advice?!
Example: https://dixonbaxi-shop.com/


Here is my site Read-Only: https://preview.webflow.com/preview/chaos-theory-3?utm_medium=preview_link&utm_source=dashboard&utm_content=chaos-theory-3&preview=92add5693e5f28c9550343ab8527006c&mode=preview
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