Complex sentence: It was long known for its great August Horse Fair, an internationally-famous annual trading event which continued to be held until the mid- 20th century, ending after World War II, when horses were generally no longer used for agriculture.
Split into simpler sentences: It was long known for its great August Horse Fair, an internationally-famous annual trading event which continued to be held until the mid- 20th century. It ended after World War II, when horses were generally no longer used for agriculture.