Complex sentence: The World War I connection to the LSWR line at Red Post Junction was removed in 1936, but the exigencies of World War II caused its reinstatement on 5 September 1943, together with doubling between Weyhill and the junction.
Split into simpler sentences: The World War I connection to the LSWR line at Red Post Junction was removed in 1936. The exigencies of World War II caused the reinstatement of the Red Post Junction connection on 5 September 1943, together with doubling between Weyhill and the junction.