Complex sentence: During the tour abroad, Grant was encouraged by his successor President Rutherford B. Hayes, to represent the United States in an unofficial diplomatic capacity in some cases This involved resolving international disputes between countries--an unprecedented role for the relatively young United States.
Split into simpler sentences: During the tour abroad, Grant was encouraged by his successor President Rutherford B. Hayes, to represent the United States in an unofficial diplomatic capacity. In some cases, this involved resolving international disputes between countries--an unprecedented role for the relatively young United States.