Complex sentence: A weekend service which ran until 1932 was also introduced between Highgate and Downham via Brockley with a total route distance of 16 miles, which was the longest tram route ever operated entirely within the County of London.
Split into simpler sentences: A weekend service, which ran until 1932, was introduced between Highgate and Downham via Brockley. With a total route distance of 16 miles, this was the longest tram route operated entirely within the County of London.