Simplify the following text for a Grade 4 native English-speaking person.
Original: As a material stained glass is glass that has been colored by adding metallic salts during its manufacture . The colored glass is crafted into stained glass windows in which small pieces of glass are arranged to form patterns or pictures , held together ( traditionally ) by strips of lead and supported by a rigid frame .
Simplified: Stained Glass is a type of glass , which is colored using metals or paint .