the first one is have->
- “Who” refers to advisors and consultants (plural).
- Therefore, the verb must be plural: have analyzed.
even though the "have-is" sounds a little off.
but - the main subject is
the committee (treated as singular in American English).
[*]Therefore, the verb is singular:
is preparing.
[*]The second one-> is "is"
[*]since the true subject is
“a set of policies”, which is singular.
[*]
Heimerdinger98
The committee, along with its advisors and consultants who (have/has?) analyzed the data, is preparing a report.
Also
Hidden beneath the layers of bureaucracy and outdated systems (are/is?) a set of policies that dictates how the resources are allocated.