Complex sentence: The 19th century windows of Clayton and Bell are typified by there brilliant luminosity as they were quick to adopt the advice of the student of Medieval glass, Charles Winston, See Influences, Stained glass-British glass, 1811-1918.
Split into simpler sentences: The 19th century windows of Clayton and Bell are typified by their brilliant luminosity. This is because they were quick to adopt the advice of the student of Medieval glass, Charles Winston, See Influences, Stained glass-British glass, 1811-1918.