We can classify the sentence shown above as a qualifier. That's because the term "qualifier," refers to a sentence (or a word, in some cases) that has the ability to attribute a characteristic, or a quality, an ability to something or someone.
In the sentence shown above, you can see that the speaker is assigning a characteristic to a group of people, when he informs you that this group will be able to provide suitable materials for a certain activity. This ability to provide adequate materials is what makes us realize that this sentence is an example of a qualifier.
Unfortunately there are no related questions so you can get more information, but you can search for example sentences that feature qualifier clauses, which will add to your understanding of the subject.
