I came across a sentence below:
Its purpose is to address a concern on the part of the xxx staff that conceptual models of processes constitute a major source of uncertainty. (xxx is the name of an organization)
My understanding is that "some of the staff in xxx" worry about the conceptual models. I thought the sentence should be
Its purpose is to address a concern by the part of the xxx staff that conceptual models of processes constitute a major source of uncertainty.
Is this correct?