Complex sentence: The International Cub Lo-Boy was painted IH/Highway/Federal yellow and were originally red until in the late 1950s they became less for farm use and was being used as an industrial machine and became yellow.
Split into simpler sentences: The International Cub Lo-Boy was painted IH/Highway/Federal yellow, but was originally red until the late 1950s. The color was changed when the Cub Lo-Boy was used less for farm work and started being used as an industrial machine where it then became yellow.