Simplify the following text for a Grade 8 native English-speaking person.
Original: The Gallipoli Campaign , also known as the Dardanelles Campaign or the Battle of Gallipoli , took place at the peninsula of Gallipoli in the Ottoman Empire between 25 April 1915 and 9 January 1916 , during the First World War .
Simplified: The Gallipoli Campaign was an Allied attack on the Gallipoli peninsula during World War I. The campaign took place between April 25 , 1915 and January 9 , 1916 .