Sentence structure in english? [closed]

I see a sentence: "The department-wide (Noun) changes (V) suggested (?) by (Preposition) Ms. Juntasa received unanimous approval from company management.". What type of word "suggested"? If it is Adj, why don't have one noun after it?


The department-wide (Adj) changes (N) suggested (V) by (Preposition) Ms. Juntasa received (main V of the whole sentence) unanimous approval from company management."