en_tn/2ch/26/02.md

It was he who rebuilt Elath

Uzziah did not do this alone. AT: "It was he who ordered Elath to be rebuilt" or "It was he who supervised the rebuilding of Elath" (See: rc://en/ta/man/translate/figs-synecdoche)

Elath

a city in Judah (See: rc://en/ta/man/translate/translate-names)

restored it to Judah

"returned it to Judah." This means that his army captured the city so that now it belonged to Judah again.

slept with his ancestors

This is a polite way to say he died. (See: rc://en/ta/man/translate/figs-euphemism)