not impossible to simplify the forms. I'm stumbling over it for the moment hoping to find a holy soul to help me.
Catia in surface is a level above
f50b161001b6 v 2022.SLDPRT (1.9 MB)
I really can't do better with SolidWorks
Some pictures for those who draw freehand 
Redrawing of sketches
The sketches that allow me to create surfaces
The surfaces are then extruded into a body The middle one I had to extrude twice. Once he makes me a box I use the surfaces to recreate surfaces (La loose), and I can extrude again to create a body. This c... software didn't want to make me a coherent volume from the start.
The bodies are then combined
A little better on the end of the green body but I can't combine anymore, by reworking the end with volume sketches it can work
[F50B161001B6 V 2022 Revb. SLDPRT|attachment]
The play
(upload://k0Q5J4Mj8bS0t2F4jAwW9DzlRX9.SLDPRT) (1.8 MB)