Complex sentence: Wood was a delegate to and spoke at the Pittsburgh, Pennsylvania Convention which organized the Republican Party in 1856, New York Times, February 22,1856, Page 4 and a delegate to the Leavenworth Constitution Convention in 1858.
Split into simpler sentences: Wood was a delegate to and spoke at the Pittsburgh, Pennsylvania Convention which organized the Republican Party in 1856. He was a delegate to the Leavenworth Constitution Convention in 1858.