How to create curves like this design?

I'm trying to replicate this design as close as possible. So far I have only attempted with simple border-radius to try and match the curves, but that doesn't seem like it will work given the abstract nature of the curves in both the hero image and yellow 'Our Mission' section.

Looking for some advice on how I can proceed with this. The more replicable the code the better, as other pages on the site will have similar curves.

The other potential tricky part is getting the 'About Us' text in the gap left of the hero image.

Any help with this would be much appreciated 🙂
Website_Design_Curves.png
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