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They did not provide a completed job description of an Impact Fee Administrator, but supplied to me some of their responsibilities. Please find the information below.
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They did not provide a full job description for an Impact Fee Administrator, but did supply a list of some of their responsibilites.
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They did not provide a full job description for an Impact Fee Administrator, but did supply a list of some of their responsibilites.

I would suggest either They did not provide a full job description for Impact Fee Administrators, but did supply a list of some of their responsibilites or They did not provide a full job description for an Impact Fee Administrator, but did supply a list of some of the responsibilites.
I don't like "their responsibilities" referring back to the single "Administrator" when there is a plural "they" (subject of the sentence) that it might be confused with. In other words, it sounds to me as if they provided a list of some of their own responsibilities.