Complex sentence: He arrived in Parma after the age of 20 yrs. There he pained frescoes including a chapel in San Giovanni Evangelista in Parma and an Altarpiece for the Duomo.
Split into simpler sentences: He arrived in Parma after the age of 20 years. There, he pained frescoes including a chapel in San Giovanni Evangelista in Parma and an altarpiece for the Duomo.