Complex sentence: The remainder of the convoy had been sunk or was falling back on Gibraltar and more air attacks disrupted the towing formation, until it was re-established with "Bramham" replacing "Ledbury" on "Ohio" s port side, for the remainder of the journey.
Split into simpler sentences: The remainder of the convoy had been sunk or was falling back on Gibraltar. Several further air attacks disrupted the towing formation, until it was re-established with "Bramham" replacing "Ledbury" on "Ohio" s port side, for the remainder of the journey.