Complex sentence: She retains the services of the greatest barrister in the Empire (Olivier) to defend her; he is incidentally, also a man she seduced and abandoned (40 years earlier); but who has remained hopelessly in love with her ever since.
Split into simpler sentences: She retains the services of the greatest barrister in the Empire (Olivier) to defend her. He is incidentally, also a man she seduced and abandoned (40 years earlier); but who has remained hopelessly in love with her ever since.