Complex sentence: William Hickling Prescott (May 4,1796--January 29,1859) was an American historian and hispanist, who is widely recognized by historiographers to have been the first American scientific historian.
Split into simpler sentences: William Hickling Prescott (May 4,1796--January 29,1859) was an American historian and hispanist. He is widely recognized by historiographers to have been the first American scientific historian.