Welcome to the Amaryllis forum. That is a beautiful clump of bulbs. You want to knock the clump out of the pot: You may have to break the pot to remove the clump. Separate the bulbs by hand into several clumps, trying to do as little damage to the bulbs. You could use a knife to saw down between the bulbs, but you do risk wounding the bulbs. I think that it would be safer to "twist" them apart if you can. The roots should untangle themselves as the bulbs pull apart. Some roots will obviously be broken off, but save as many as you can. Repot a few bulbs in each pot with fresh soil. The leaves will probably die back from the stress, but I think that they will come back in the spring just fine.
