Original sentence: It was first officially flown on 11 November, 2003, at the opening of the Australian War Memorial in Hyde Park, London.The flag is of historical importance, having been the symbol that Australia has grown up under and the symbol that has been associated with all of her achievements on the international scene
Edited sentence: It was first officially used to represent Australia overseas on 11 November, 2003, at the opening of the Australian War Memorial in Hyde Park, London by Her Majesty Queen Elizabeth II.The flag is of historical importance, having been the symbol that Australia has grown up under and the symbol that has been associated with all of her achievements on the international scene, such as every Olympic games since 1908