Complex sentence: A branch to Chilton Pit was authorised in 1833 and opened in 1835 and the Byers Green branch opened on 31 March 1837' the City of Durham branch was not built north of Ferryhill, and nor was the Deanery branch.
Split into simpler sentences: A branch to Chilton Pit was authorised in 1833 and opened in 1835 and the Byers Green branch opened on 31 March 1837. The City of Durham branch was not built north of Ferryhill, and nor was the Deanery branch.