Complex sentence: It is a group of tropical epiphyte orchids that grow mainly in the warm low-lands of the tropics of Asia that are highly prized in horticulture for their racemes of showy, intensely fragrant, and colorful flowers.
Split into simpler sentences: It is a group of tropical epiphyte orchids that grow mainly in the warm lowlands of tropical Asia. They are valued in horticulture for their racemes of showy, fragrant, colorful flowers.