Neil Smith wrote:

The plant fills a very large pot. How do you slpit it? There us no sign of
new growth.

Very, *very* easy Neil. Your plant consists of a network of thick,
rhizomes (horizontal, underground stems) from which the leaves arise
along their length. Just slice down through the plant, making sure
that each portion has plenty of rhizomes and roots. Pot them up and
that's it. If you wanted a lot of plants, you could shake all of the
old compost away and cut the rhizomes up into section with one or two
leaves each. Pot them up and in a couple of years you can start
selling them.