I tried fumbling around with the subdivision tool, but wasn't able to arrange it correctly. I also have some other more complex patterns, so I wonder if there is an easier way of doing this kind of operation.
Press CtrlR, then use the scroll wheel to bring the number of cuts up to two. Enter out of it, and then press S to to scale, and constrain it to a specific axis. This insures that the loop cuts are evenly spaced, and not one further away from the edge than the other.
You might notice that the middle edges go through the top and bottom sections. While you might now like to see this, it is necessary. You could technically do with out it by using N-Gons, but this is generally a bad idea.
After turning away from the problem and coming back to it later, I suddenly had the answer:
- Mark 2 opposite edges and subdivide the face with 2 cuts.
- Mark the 2 edges going through the original face and subdivide with 2 cuts again, then arrange the edges as necessary.
My other question still persists, though: Is there a generally easier way of dividing plain faces into specific patterns?