Complex sentence: After being first tutored at home, Pliny travelled to Rome where he furthered his education and was taught rhetoric by the great teacher and author Quintilian and Nicetes Sacerdos of Smyrna.
Split into simpler sentences: After being first tutored at home, Pliny went to Rome for further education. There he was taught rhetoric by Quintilian, a great teacher and author, and Nicetes Sacerdos of Smyrna.