Complex sentence: On 1st May 1867, the London, Chatham and Dover Railway leased the original 2 tracks to the London, Brighton and South Coast Railway, for use by its new South London Line service (which run between Victoria and London Bridge via Denmark Hill).
Split into simpler sentences: On 1st May 1867, the London, Chatham and Dover Railway leased the original 2 tracks to the L.B. &. S.C railway, for use by its new South London Line service (which run between Victoria and London Bridge via Denmark Hill).