I understand the meaning, But I don't know what is the name of these structures in grammar? and I'm not sure if "structure" is the right word for explaining my purpose. Please correct me if there is a better word to describe my question :)
Here is the whole sentence:
Entente is not a formal treaty but an agreement arrived at through diplomatic conversation, which leads to common action and policy.
the "to arrive at an agreement" is the original collocation/structure. But in the new form, we have "the agreement arrived at". What is this structure called? is it some kind of "inversion"?