Complex sentence: In July 1981, the Cadillac and Lake City Railroad began operations over a former portion of the Chicago, Rock Island and Pacific Railroad between Simla through Limon, Colorado, to Colby, Kansas, about 171 miles (km).
Split into simpler sentences: In July 1981, the Cadillac and Lake City Railroad began operations of a former portion of the Chicago, Rock Island and Pacific Railroad. These operations included Simla through Limon, Colorado, to Colby, Kansas, about 171 miles (km).