It's hard to see in the photo, but a couple of the branches are just suckers that came out of the base and go straight up. They are going. I would like to take the low one on the right, bend it down, and make a nice cascade, but the branch looks real weak. Most of the top goes, of course. And, I will lower the soil level somewhat and see how the trunks branch out. I don't think I want to keep any dead wood. Would I want to start chopping now? Wait a year? Chop a branch at a time over the summer? The root ball fills up the top half of the pot, and I don't think I want to touch it for a year or so.
I thought the pot was about a foot and a half, and I said half a meter. So, the issue is poor memory and lousy estimation, not inability to divide by three.