Bulbos like this sprawl, and take up a lot of space. I would not separate pieces that small. Bulbo roots like to stay wet at all times. In a home it is hard to water adequately ones like this growing out of the pot. Without a humid greenhouse these aerial roots dry out fast, and the plant becomes stunted. Bulbos typically have much shorter roots than do other orchids, so they don't need deep pots.
Consider a different growing method. Use a shallow plastic tray, like the ones used at supermarkets to hold party platters of vegetables, sandwiches or cookies. For a smaller plant like yours a plastic tray that held a cut of meat would also work. Don't put a drainage hole in it. Put a layer of large gravel or LECA balls on the bottom. Top with a low mound of sphagnum moss. Nestle the plant well into the sphagnum. Be sure all the roots are in the sphagnum.
Keep water in the tray at all times, about halfway up the layer of gravel or LECA. The moss will stay wet and the Bulbo will be happy.
There are Bulbos with tightly clumping pseudobulbs rather than long rhizomes between. You can read about them before you buy at orchidspecies.com. I still look up every species I'm contemplating buying so I know I can give it the temperatures it wants, and I know how to pot it.
The Cirrhopetalum group of Bulbos is excellent for windowsills. Most are compact plants with bright, odorless flowers, several times throughout the year. They can be grown in a standard pot. Sphagnum or fine bark works well.
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