Complex sentence: In 1964 Le Mesurier moved out of his marital house and allowed Jacques to bring a divorce suit on grounds of his own infidelity, to ensure that the press blamed him for the break-up, thus avoiding any negative publicity for her.
Split into simpler sentences: In 1964 Le Mesurier moved out of the marital home and allowed Jacques to bring a divorce suit on grounds of his own infidelity. This was to ensure that the press blamed him for the break-up, thus avoiding any negative publicity for her.