raspberry canes

It should be straightforward - they don't have complicated root systems.

Dig the whole clump up and gently follow the canes down to tease the roots apart.  Replant with added manure if you have any.

If you are replanting them in the same place as they've come out from, I'd suggest briefly covering the roots with something so they don't dry out before you've re-prepared the bed for replanting.