You can go with either option. Two will be fine together in the pot but you just might need to water or fertilize a little more to compensate for the extra plant. I sometimes find that one will take over and the others offsets will hang back and remain small until they get an opening.
If you want to divide it, move a little soil and take a look down at where the offset grew off the main root. There should be a joint or a point where it looks like the two plants can be cut apart. Just slice through there with either a knife or shovel.
I should have kept that broken shop vac.... didn't think of just using the base.