Vandae do not like having roots disturbed. If a vanda has outgrown its basket, carefully place old basket into new larger basket.If you have roots growing every which way, open up the new basket and carefully coax the roots into place. The roots will soon grab on to their new surroundings.
As to dividing them, many vandae grow naturally as clumps of keikis (Ascocentrum, Neofinetia, etc.). Each keiki has potential to flower, so why lessen the show by dividing.
Your plant looks healthy and content. If it were mine, I'd keep it as is.
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