in france, people still tend to eat more foramlly, with the whole family sitting around the table for a leisurely meal, accompanied by a few glasses of wine.

여기에서 accompanied 앞에 콤마가 와야하는 이유가 궁금합니다.
또한 accompanied 이하가 meal을 꾸며주는 건가요?
알려주세요 감사합니다~~