Complex sentence: At about the same time, Fairbanks & Co employee Charles Hosmer Morse opened an office of Fairbanks & Co in Chicago, from which he expanded the company's territory of operation and widened its product line.
Split into simpler sentences: At about the same time, Fairbanks & Co employee Charles Hosmer Morse opened an office of Fairbanks & Co in Chicago. He expanded the company's territory of operation and widened its product line.