Cane, when they are like that it is time to do some root and leaf untangling.
The way I used to do it in the greenhouse would be to use my fingers and dig in on the inside between varieties and lift them all out and set the cluster clump on moist potting soil. Then the fun begins. Ya pull off a corner of them slowly and loosely, actually listening and feeling for breaking roots, twisty, shaky, tenderly. Ya have your 4 inch pots already half full with the soil having holes worked out in the middle. Separate one or 2 at a time, trying to get them all as singles. Ya promise yourself never to sow that thickly again...every year...sometimes 2 are INEXTRICABLY INTERWOVEN. That's ok, long as it's only one in 20 or so. If it's 3, one dies, sorry. pinch of death on the smallest. If there are very few to start with and or the seed was expensive, using a bucket of water to separate them with the roots in it helps. Trouble with that is, then the roots all want to lay limp and do not want to spread easily. If you don't then spread their roots, it may languish or even die. Repeat the process of removing a small part of them to separate and plant. It can be like a puzzle!