Complex sentence: Spread over an area of, Kolkata airport is the largest hub for flights to Northeast India and one of two international airports operating in West Bengal, the other one being in Bagdogra.
Split into simpler sentences: Spread over an area of, Kolkata airport is the largest hub for air traffic in the eastern part of the country. And one of two international airports operating in West Bengal, the other one being in Bagdogra.