Complex sentence: The Paducah shops were converted to maintain diesel locomotives as steam locomotives were replaced through the 1940s and 1950s; and a nationally known rebuilding program for aging diesel locomotives from Illinois Central and other railroads began in 1967.
Split into simpler sentences: The Paducah shops were converted to maintain diesel locomotives as steam locomotives were replaced through the 1940s and 1950s. A nationally known rebuilding program for aging diesel locomotives from Illinois Central and other railroads began in 1967.