Complex sentence: Gannett was founded in 1906 by Frank Gannett, who ran a news correspondence syndicate while attending Cornell University, and by 1989 had amassed 19 New York daily newspapers.
Split into simpler sentences: Gannett was founded in 1906 by Frank Gannett. Gannett ran a news correspondence syndicate while attending Cornell University, and by 1989 had amassed 19 New York daily newspapers.