Complex sentence: The Surrey Iron Railway from Croydon to Wandsworth opened in 1803 and was the world's first public railway, which developed into an important means of transport, facilitating Croydon's growth as a commuter town for London (including the City of London).
Split into simpler sentences: The Surrey Iron Railway from Croydon to Wandsworth opened in 1803 and was the world's first public railway. Later nineteenth century railway building, facilitated Croydon's growth as a commuter town for London (including the City of London).