Complex sentence: In about 1480, he was called to Rome to fresco panels for the Sistine Chapel walls by Sixtus IV including "Moses and Zipporah" (often attributed to Luca Signorelli), the "Baptism of Christ", and "Delivery of the Keys".
Split into simpler sentences: In about 1480, he was called to Rome by Sixtus IV to paint fresco panels for the Sistine Chapel walls. The frescoes he executed there included "Moses and Zipporah" (often attributed to Luca Signorelli), the "Baptism of Christ", and "Delivery of the Keys".