Памагите a defining relative clause contains essential information to the meaningof the sentence and cannot be removed. It is not put in commas. Thepsychologist who came up with the theory of multiple intelligences isHoward Gardner.a non-defining relative clause contains non-essential information to themeaning of the sentence and can be removed. It is put in commas. Theuniversity, which has two large libraries, is one of the best in the country.​