Complex sentence: A glass pane that is coated with a low emissivity material typically has an emissivity less than 0.2, and can remain reasonably transparent; such coatings are used to maake commercial "low-e" windows.
Split into simpler sentences: A glass pane that is coated with a low emissivity material typically has an emissivity less than 0.2, and can remain reasonably transparent. This approach is used to maake commercial "low-e" windows.