Complex sentence: He attended Metropolitan Business College in Chicago, Illinois, and Gonzaga University in Spokane, Washington; after graduating in 1897, he worked on railroads in a number of capacities, as a trainman, conductor, and telegraph operator, until 1910.
Split into simpler sentences: He attended Metropolitan Business College in Chicago, Illinois, and Gonzaga College in Spokane, Washington, and graduated in 1897. He worked on railroads in a number of capacities, as a trainman, conductor, and telegraph operator, until 1910.