Complex sentence: The Philadelphia Bourse was a commodities exchange founded in 1891 by George E. Bartol, a grain and commodities exporter, who modeled it after the Bourse in Hamburg, Germany.
Split into simpler sentences: The Philadelphia Bourse Building was a commodities exchange founded in 1891 by George E. Bartol, a grain and commodities exporter. It was modeled after the Bourse in Hamburg, Germany.