Complex sentence: An elevated walkway across Waterloo Road connects it to London Waterloo station and provides the main access; the eastern ends of Waterloo East platforms have pedestrian connection to Southwark station on the London Underground Jubilee line; at street level there is a modest entrance in Sandell Street.
Split into simpler sentences: An elevated walkway across Waterloo Road connects it to Waterloo station and provides the main access. The eastern ends of Waterloo East platforms have pedestrian connection to Southwark station which is served by London Underground's Jubilee line; at street level there is a modest entrance in Sandell Street.