en_tn/2ch/01/01.md

was strengthened in his rule

This can be stated in active form. Alternate translation: "gained complete control over his kingdom" or "ruled powerfully over his kingdom" (See: rc://en/ta/man/translate/figs-activepassive)

Yahweh

This is the name of God that he revealed to his people in the Old Testament. See the translationWord page about Yahweh concerning how to translate this.

God was with him

Here "was with him" is an idiom. Alternate translation: "God supported him" or "God helped him" (See: rc://en/ta/man/translate/figs-idiom)