I have ones that grow roots like that, and I know they are one plant because I had them when there were less bulbs.
It could be two, or it could just be that as the plant has got older part of it has started seperating from the other part. I have ones which when I repot they feel like they are about to fall in two (and sometimes I get accidental divisions when they do).
Often a bulb will grow from two sides, then new growths come from them, then as the oldest bulb falls away with age, the rhyzome connecting the two parts on either size of where the bulb used to be will also age and start to disintegrate... and you naturally end up with a division.
If you do keep both halves from separating then often new bulbs may fill the gap... however they don't reconnect, so still all that is holding the parts is an old bit of wobbly rhyzome.
I think it's impossible to tell unless you repot, and even then if it seems like two plants it might have been one originally