Complex sentence: When US 71 was moved onto its current alignment bypassing Colfax around 1950, State Routes 1 and 5 were moved along with it, and the old route was re-designated as State Route C-2116 until the 1955 Louisiana Highway renumbering.
Split into simpler sentences: When US 71 was moved onto its current alignment bypassing Colfax around 1950, Routes 1 and 5 were moved along with it. The former alignment became State Route C-2116 until the 1955 Louisiana Highway renumbering.