Complex sentence: Birbraer was born in Kamenogorsk, Kazakhstan, where he lived until the age of 14; his family lived under a non-Jewish sounding surname in those years due to severe local anti-Semitism.
Split into simpler sentences: Birbraer was born in Kamenogorsk, Kazakhstan, where he lived until the age of 14. His family lived under a non-Jewish sounding surname in those years due to severe local anti-Semitism.