Found this during review. It is possible that the initial intention was to highlight that the questionnaires belong to the person and not the evaluation - in that case, I would opt for adding punctuation like
A contributor, who is assigned to an evaluation, and their questionnaires.
Found this during review. It is possible that the initial intention was to highlight that the questionnaires belong to the person and not the evaluation - in that case, I would opt for adding punctuation like