Complex sentence: The aisle and crenellated tower with crocketed pinnacles are of Decorated Gothic period, the tower incorporating some Saxon elements, and there are remnants of 14th century glass in the aisle windows.
Split into simpler sentences: The aisle and crenellated tower with crocketed pinnacles are of Decorated style, with the tower incorporating Saxon elements. There are remnants of 14th-century glass in the aisle windows.