Complex sentence: In the spring of 1202 Philip attacked Normandy while Arthur attacked Poitou, but the young duke was surprised by King John in the siege of Mirebeau, and taken prisoner with his troops.
Split into simpler sentences: In the spring of 1202 Philip attacked Normandy while Arthur attacked Poitou. But the young duke was surprised by King John in the siege of Mirebeau, and taken prisoner with his troops.