Complex sentence: After negotiations between the French and British governments and directives from Paris to the authorities in the south of France, the Wellingtons flew back and commenced operations on the night of but all but one of the eight bombers returned without bombing due to bad weather.
Split into simpler sentences: After negotiations between the French and British governments and directives from Paris to the authorities in the south of France, the Wellingtons flew back. Operations commenced on the night of but all but one of the eight bombers returned without bombing due to bad weather.