shit, it's really easy to divide up plants like that (only a few weeks of growing together. You can either take a garden spade and cut between the plants and lift out the plant by the roots with the spade or you can carefully dump them out and using a hose, wash the soil and roots while you separate them. Then take the cleaned roots and spread them out horizontally in the new pot of soil (filled part way). Then fill in the rest of the soil. and water it in.

Shov