Original: Because of their Jewish origin, violinists Norbert Brainin, Siegmund Nissel and Peter Schidlof (later violist) were driven out of Vienna after Hitler's Anschluss of 1938.
Simplified: Violinists Norbert Brainin, Siegmund Nissel and Peter Schidlof were forced to leave Vienna for London because of their Jewish origin after Hitler's Anschluss of 1938.