And I simply don't understand how to import it properly. Judging by what's there, the model is completely broken, but it's rigged. If I try to fix the model through CATs, Blender crashes.

When importing FBX into Unity and converting the model to Humanoid it shows me an error

I've already managed to split the FBX, but the small components are because when I try to delete them... This is a compelling argument. The FBX reverts to its original state (as I understand it, blendshapes). So, I have several FBXs.

Simply put, how do I import them into Unity properly?