Q.Plant identification
Can you identify this plant? It was horribly overgrown when I bought the house. I finally decided to just dig it up and see if I could successfully divide it. The trunk-like roots (?) have me stumped.

These appear to be Iris rhizomes.
The white on the rhizomes is where they have been damaged in the dig.
I would sort the plants and look for healthy rhizomes attached to one fan.
These links have more information.
https://www.gardeningknowhow.com/ornamental/bulbs/iris/dividing-transplanting-iris.htm
https://www.gardeningknowhow.com/ornamental/bulbs/iris/divide-bearded-irises.htm