Simplify the following text for a Grade 5 native English-speaking person.
Original: The Battle of Passchendaele was one of the major battles of the First World War , taking place between July and November 1917 .
Simplified: The Battle of Passchendaele ( also called the Third Battle of Ypres ) was a major battle of World War I. It took place between July and November 1917 .