"Marie loves her teacher, who gives candy to his students in the exams."
The subordinate clause in this sentence is "who gives candy to his students in the exams." It doesn't give complete thought, and cannot stand alone as a sentence.
I think all stories have these kind of clauses, so just try looking for an appropriate story then look for sentences with subordinate clauses. You can just google it; there are a LOT, I'm telling you. Hope I kind of helped. :)