Complex sentence: The Lanxin High-Speed Railway has particularly strong winds which blow on most days of the year; a 67-kilometre long wind-protection "gallery" has been proposed to be built in this region.
Split into simpler sentences: The Lanxin High-Speed Railway has particularly strong winds which blow on most days of the year. It is proposed that a 67-kilometre long wind-protection "gallery" will be built in this region.