Some examples of adjective clauses would be the following:
The audience applauded the singer who performed the breathtaking solo.
My mother’s apple pie recipe, which has won numerous contests, has the perfect amount of cinnamon and nutmeg.
Darius, whose paintings are all over the art classroom, wants to study design in college.
Our new team captain will be Sylvia, whom I have played soccer with since childhood.
I had to try on the jacket that was on the mannequin.