Complex sentence: He graduated from Andover Academy in 1894 and Massachusetts Institute of Technology in 1897, then worked for Fenn's Manufacturing Contracting Company for a number of years before he joined DuPont.
Split into simpler sentences: He graduated from Andover Academy in 1894 and the Massachusetts Institute of Technology in 1897. He worked for Fenn's Manufacturing Contracting Company for a number of years before he joined DuPont.