Complex sentence: It is situated at the end of a short branch from the West Anglia Main Line, which was constructed at a cost of £44 million and opened in 1991, to coincide with the completion of the airport's new terminal building.
Split into simpler sentences: It is situated at the end of a short branch from the West Anglia Main Line. The branch was constructed at a cost of £44 million and opened in 1991, to coincide with the completion of the airport's new terminal building.