Complex sentence: The French administration of Indochina originally built a railway from Saigon to Loc Ninh in the 1930s, to be connected to Cambodia; it was abandoned in 1945, at the start of the First Indochina War.
Split into simpler sentences: The French administration of Indochina originally built a railway from Saigon to Loc Ninh in the 1930s, with the intent of extending it further into Cambodia. It was abandoned in 1945, at the start of the First Indochina War.