Simplify the following text for a Grade 7 native English-speaking person.
Original: A Rose window ( or Catherine window ) is often used as a generic term applied to a circular window , but is especially used for those found in churches of the Gothic architectural style and being divided into segments by stone mullions and tracery .
Simplified: Rose window is a word used to describe a round window design , which is similar to the many petals of a rose . Most often the term is used to describe the round windows of some churches , especially those built in Gothic style .