Complex sentence: The most remarkable exterior feature is a Decorated chancel, a bequest from the Rookwood family in the 14th century, noted for the design and craftsmanship of the window tracery.
Split into simpler sentences: The most remarkable part of the exterior is a Decorated chancel, a bequest from the Rookwood family in the 14th century. It is noted for the design and craftsmanship of the window tracery.