Complex sentence: The church tower was built in the late 14th century, and in the 15th century, a growth in village population prompted the builing of the North Aisle, including removal of the North wall and replacing it with pillars.
Split into simpler sentences: The church tower was built in the late 14th century. In the 15th century the north aisle wsa built, including removal of the north wall and replacing it with pillars.