Complex sentence: In 1963 the German opposition leader Willy Brandt said that "abnegation is betrayal", but it was Brandt who eventually changed West Germany's attitude with his policy of "Ostpolitik".
Split into simpler sentences: In 1963 the German opposition leader Willy Brandt said that "abnegation is betrayal". But it was Brandt who eventually changed West Germany's attitude with his policy of "Ostpolitik".