Complex sentence: The Millennium train, like the Tangara, is a double decker, four car consist, with the middle two cars being non-control motor cars and the two outer cars being driving control trailer cars fitted with the pantograph.
Split into simpler sentences: The Millennium train, like the Tangara, is a double decker. It is a four car consist, with the middle two cars being non-control motor cars and the two outer cars being driving control trailer cars fitted with the pantograph.