Complex sentence: The success of the suburban lines tempted KES to extend their streetcar service west from Skøyen as a suburban line; the Lilleaker Line opened to Lilleaker on 9 May 1919, to Avløs in 1924 and to Kolsås in 1930.
Split into simpler sentences: The success of the suburban lines tempted KES to extend their streetcar service west from Skøyen as a suburban line. The Lilleaker Line opened to Lilleaker on 9 May 1919, to Avløs in 1924 and to Kolsås in 1930.