Complex sentence: He began by taking lessons from his father at the age of five, and since then has studied with Yuri Petrossian, Nestor Eidler, who was a disciple of Szentgÿorgyi and David Oistrach.
Split into simpler sentences: He began by taking lessons from his father at the age of five. Since then, he has studied with Yuri Petrossian and Nestor Eidler, who was a disciple of Szentgÿorgyi and David Oistrach.