Complex sentence: Dissatisfaction with the conduct of the war was growing with the public in Britain and in other countries, aggravated by reports of fiascos, especially the humiliating defeat of the Charge of the Light Brigade at the Battle of Balaclava.
Split into simpler sentences: Dissatisfaction with the conduct of the war was growing with the public in Britain and in other countries. Public dissatisfaction with the conduct of the war, aggravated by reports of fiascos, especially the humiliating defeat of the Charge of the Light Brigade at the Battle of Balaclava.