I am uploading an .skp showing the building. One side of it already has texture glued onto it, though incorrectly; I intend to correct this as soon as I find out how. In any case, I was wondering, how do I glue texture onto the side of a building that is made up of several different planes, some at an angle to each other?

.skp of the building with uneven sides

I'm as new to Sketchup as can be, having only tried to use it for the past few hours. Essentially the problem is, I have a building onto whose surfaces I need to drape (is that the correct term?) textures. The problem is, the facade, the back and all the sides of the building are made up of multiple flat surfaces, some at an angle to each other (i.e., parts of the facade protrude forward at an angle to the rest of it, etc.) I presume I need to combine each side into one surface to drape/glue a texture onto it. My question is, how do I accomplish this? I tried using the Cleanup plugin, with no apparent results. Or do I have to break my texture up into pieces, one piece for each flat surface?

Thank you all for the advice.