Complex sentence: In August 2005, in a letter asking the Home Secretary to pardon him, Bamber's lawyers wrote that there were four million documents in the case, one quarter of which had not been disclosed to the defence.
Split into simpler sentences: In August 2005, Bamber's lawyers asked the Home Secretary to pardon him. The letter to the Home Secretary said there were four million documents in the case, one quarter of which had not been disclosed to the defence.