Complex sentence: In 1914, at the age of six, Oistrakh performed his debut concert, and later entered the Odessa Conservatory in 1923, where he studied until his graduation in 1926.
Split into simpler sentences: In 1914, at the age of six, Oistrakh performed his debut concert. He entered the Odessa Conservatory in 1923, where he studied until his graduation in 1926.