Question About Importing Models To Unity

Hi, I would like to know, if I create a model using Sketchup, such as a room made out of a single cube, and then I import that model into Unity, would the object in Unity be only one object, or would it be a combination of objects?

Like if I make a wall with a window in Unity I have to make four parts to it, the parts to either side of the window, and the parts above and below the window and then I would have to link those together using a blank object as the parent.

So if I used Sketchup to make a hole in the wall and then imported it, would it be one object or the same as if I had made it in Unity? Kinda considering Sketchup as a way to lower the number of objects I will need to useā€¦