Complex sentence: Additional layers of glazing provide the opportunity for improved insulation, while the standard double glazing is most widely used used, triple glazing is not uncommon, and quadruple glazing is produced for very cold environments such as Alaska.
Split into simpler sentences: Additional layers of glazing provide the opportunity for improved insulation. While the standard double glazing is most widely used, triple glazing is not uncommon, and quadruple glazing is produced for very cold environments such as Alaska.