Simplify the following text for a Grade 6 native English-speaking person.
Original: In 1522 Willaert had a post at the court chapel of Duke Alfonso ; he remained there until 1525 , at which time records show he was in the employ of Ippolito II d'Este in Milan .
Simplified: In 1522 Willaert had a job at the court chapel of Duke Alfonso ; he stayed there until 1525 .