Complex sentence: Excursion trains from as far away as Buffalo, New York and Pittsburgh would come just to cross the Kinzua bridge, which held the height record until the tall Garabit Viaduct in France was completed in 1884.
Split into simpler sentences: Excursion trains from as far away as Buffalo, New York and Pittsburgh would come just to cross the bridge. The Kinzua Bridge held the record until the high Garabit Viaduct in France was completed in 1884.