Complex sentence: On 9 January 1951 Lord Manton married Mary Hallinan, known as Mimi, the daughter of Major Thomas Dennehy Hallinan, of County Cork.
Split into simpler sentences: On 9 January 1951 Lord Manton married Mary Hallinan, whose nickname was Mimi. She was the daughter of Major Thomas Dennehy Hallinan, of County Cork.