Complex sentence: Sheep were the most common farm animal in England during the period, their numbers doubling by the 14th century, and became increasingly widely used for wool, particularly in the Welsh borders, Lincolnshire and the Pennines.
Split into simpler sentences: Sheep were the most common farm animal in England during the period, their numbers doubling by the 14th century. Sheep became increasingly widely used for wool, particularly in the Welsh borders, Lincolnshire and the Pennines.