Complex sentence: In 1585 he accepted an offer by Philip II of Spain to decorate the new Escorial at a yearly salary of 2000 crowns, and worked at the Escorial from January 1586 to end of 1588, when he returned to Rome.
Split into simpler sentences: In 1585 he accepted an offer by Philip II of Spain to decorate the new Escorial at a yearly salary of 2,000 crowns. He worked at the palace from January 1586 to end of 1588, when he returned to Rome.