Basic Unity Model Rendering?

I’m working on a game with a few friends of mine and our problem is that the online generator from which we retrieved the model files provides the pieces separate from the actual torso of said model. I was wondering, is there a way to combine the two models withing unity, or would we have to open them in blender and combine them?

You might be able to do it with a script in Unity, but the easiest and quickest would be to do it in Blender.