Complex sentence: The Battle of Aland Islands, or the Battle of Gotland, which took place on July 2 1915 was a naval battle of World War I between the German Empire and the Russian Empire, assisted by a submarine of the United Kingdom.
Split into simpler sentences: The Battle of Aland Islands, or the Battle of Gotland, which took place on July 2 1915. Was a naval battle of World War I between the German Empire and the Russian Empire, assisted by a submarine of the United Kingdom.