Complex sentence: The Battle of Kallo (June 20th 1638) was a battle of the Eighty Years' War it took place when a Dutch army tried to surround the city of Antwerp.
Split into simpler sentences: The Battle of Kallo (June 20th 1638) was a battle of the Eighty Years' War. It took place when a Dutch army tried to surround the city of Antwerp.