Consider below the partitive NP "a group of business leaders and politicians".
Today, a group of business leaders and politicians held a meeting in which they discussed a wide range of topics, from climate change to the impacts of the pandemic.
Typically, partitive NPs have the following structure: quantifier + of + partitive oblique. My question here is whether the partitive oblique in this sentence ('business leaders and politicians') is an NP (so that the entire partitive NP contains an embedded noun phrase) or a nominal (as, for instance, old man is in the sentence The old man was very courteous).
If the partitive oblique is indeed an NP, are there there any other examples of such nested NPs?