Complex sentence: The east window has three lights (sections of window separated by mullions) topped with tracery and ogee heads; the other two 15th-century windows are set in square frames and have pairs of lights headed with cinquefoils (a five leaf pattern).
Split into simpler sentences: The east window has three lights (sections of window separated by mullions) topped with tracery and ogee heads. The other two 15th-century windows are set in square frames and have pairs of lights headed with cinquefoils (a five leaf pattern).