Original: He was accepted into the studio of Jean-Auguste-Dominique Ingres in 1830, at the age of eleven, becoming the favorite pupil of the great classicist, who came to regard him as his truest disciple.
Simplified: In 1830, at the age of eleven, he started to study with Jean-Auguste-Dominique Ingres, and soon he became the favorite pupil of the great classicist.