Complex sentence: The First Battle of Heligoland Bight was the first naval battle of the First World War, fought on 28 August 1914, after the British planned to attack German patrols off the north-west German coast.
Split into simpler sentences: The First Battle of Heligoland Bight was the first naval battle of the First World War, fought on 28 August 1914. The British planned to attack German patrols off the north-west German coast.