Complex sentence: Aspenberg, 1994: 12 In 1916, the Holmenkollen Line was extended to Tryvann, with the last part from Frognerseteren single track and used for freight, Aspenberg, 1994: 14 and removed in 1939.
Split into simpler sentences: Aspenberg, 1994: 12 In 1916, the Holmenkollen Line was extended to Tryvann. The last part, from Frognerseteren to Tryvann, was single track and used for freight, Aspenberg, 1994: 14 but removed in 1939.