In the second year of Pekah son of Remaliah, king of Israel

It can be stated clearly that this is the second year of his reign. Alternate translation: "In year 2 of the reign of Pekah son of Remaliah, king of Israel" (See: rc://en/ta/man/translate/figs-explicit and rc://en/ta/man/translate/translate-numbers)

Jotham son of Azariah, king of Judah began to reign

"Jotham son of Azariah, king of Judah became king of Judah"