It looks like that pot is pretty crowded. LOL

You're going to have to take a look at what's going on down under. If you can get a piece(s) of the stem with roots you should be able to separate them successfully.

Another option, would be to take cuttings. I would give you more plants, too.
Gail

I trim the roots on mine when I repot them, but not in the Fall. This needs to be done in the Spring when they have a season to rejuvenate. I agree that this one is in much too small a container. I would just cut it back, root the cuttings and repot next Spring