This verse is the customary closure of the period of reign of a king. Read this verse together with 2 Kings 14:25—together they say something about the extent of the enlargement of Israel and Judah's territory.
However, there is a problem with the part restored…to Judah.
Some commentators leave to Judah
out, for this could have been added later by mistake.
What is also a possibility is that the writer wants to highlight that Hamath and Damascus in times of the undivided kingdom fell under the reign of the royal house of Judah with King David and King Salomon. In that case we can hear some homesickness here: when we were undivided and reigned from Judah, the reign was so great that Damascus and Hamath were included in it.
28 Le reste des actions de Jéroboam, tout ce qu'il a fait, ses exploits à la guerre, et comment il fit rentrer sous la puissance d'Israël Damas et Hamath qui avaient appartenu à Juda, cela n'est-il pas écrit dans le livre des Chroniques des rois d'Israël?