Complex sentence: The line between Woodside and Selsdon closed for regular services on 1st January 1917 but was retained for oocasional special services, It was reopened with a regular passenger services upon electrification of the line through to Sanderstead on 30 September 1935.
Split into simpler sentences: The line between Woodside and Selsdon closed for regular services on 1 January 1917 but was retained for oocasional special services. It reopened with a regular passenger services upon electrification of the line through to Sanderstead on 30 September 1935.