Complex sentence: Nicolò dell' Abate, sometimes Niccolò, (1509 or 1512--1571) was an Italian Mannerist painter and decorator, of the Emilian school, who was part of the staff of artists called the School of Fontainebleau that introduced the Italianate Renaissance to France.
Split into simpler sentences: Nicolò dell' Abate, sometimes Niccolò, (1509 or 1512--1571) was an Italian painter and decorator. He was of the Emilian school, and was part of the staff of artists called the School of Fontainebleau that introduced the Italianate Renaissance to France.