Complex sentence: The Croxley Rail Link is a railway engineering project in the Watford and Three Rivers districts of Hertfordshire, England that would have connected the London Overground and the London Underground's Metropolitan line at.
Split into simpler sentences: The Croxley Rail Link is a railway engineering project in the Watford and Three Rivers districts of Hertfordshire, England. The result would connect the London Overground and the London Underground's Metropolitan line at.