Complex sentence: Britten had completed about two-thirds of the opera when Ford was dismissed from Associated Rediffusion, allegedly for administrative shortcomings and inexperience, and A-R appeared on the point of withdrawing from the project for financial reasons.
Split into simpler sentences: Britten had completed about two-thirds of the opera when Ford was dismissed from Associated Rediffusion, allegedly for administrative shortcomings and inexperience. A-R then appeared on the point of withdrawing from the project for financial reasons.