Complex sentence: In 1346, Edward III of England requested that miners from the Forest of Dean, Gloucestershire accompany his expedition to France, during the first part of the Hundred Years' War between England and France.
Split into simpler sentences: In 1346, Edward III of England requested that miners from the Forest of Dean, Gloucestershire accompany his expedition to France. This was during the first part of the Hundred Years' War between England and France.