Since no one else is jumping in... I would just replant the whole string. It's not too large and I can't imagine it causing any harm -unlike the risk of breaking it up and allowing rot to set in-

the only plus I can see on splitting would be the possibility of new plants growing from the older segments, a nice bonus if you're looking to get more plants

surely someone here must have more experience! I thought they were practically an English or Pacific Northwest garden staple :)