Complex sentence: Wilkinson met with Spanish Governor Esteban Rodríguez Miró and managed to convince him to allow Kentucky to have a trading monopoly on the Mississippi River; in return he promised to promote Spanish interests in the west.
Split into simpler sentences: Wilkinson met with Spanish Governor Esteban Rodríguez Miró and managed to convince him to allow Kentucky to have a trading monopoly on the Mississippi River. In return Wilkinson promised to promote Spanish interests in the west.