Complex sentence: It also obtained powers for the Ouse Valley Railway, from Balcombe on the Brighton main line to Uckfield and Hailsham; an extension to St Leonards was also approved in May 1865.
Split into simpler sentences: It also obtained powers for the construction of the Ouse Valley Railway, a project to build a line from Balcombe railway station on the Brighton main line to Uckfield and Hailsham. An extension of this line to St Leonards was also approved in May 1865.