Complex sentence: Teresa Georgina "Tess" Rothschild (née Mayor 1915--1996), was a British counter-intelligence officer and magistrate, and the second wife of Victor Rothschild, 3rd Baron Rothschild.
Split into simpler sentences: Teresa Georgina "Tess" Rothschild, (née Mayor; 1915--1996) was a British counter-intelligence officer and magistrate. She was the second wife of Victor Rothschild, 3rd Baron Rothschild.