Complex sentence: The proposed Croxley Rail Link, a scheme to divert the Metropolitan Line's Watford branch to Watford Junction via the disused Croxley Green branch, might also see the first appearance at the station in revenue service of LU surface stock, operating from Baker Street.
Split into simpler sentences: The proposed Croxley Rail Link would divert the Metropolitan Line's Watford branch to Watford Junction Railway Station via the disused Croxley Green branch. It might also see the first appearance at the station in revenue service of LU surface stock, operating from Baker Street.