This can be reworded so that the abstract nouns "justice" and "strength" are expressed as adjectives. These words can begin a new sentence. Alternate translation: "Yahweh will cause the judges to be just and will cause to be strong those who" (See: [[rc://en/ta/man/jit/figs-abstractnouns]])
Here "to turn back" is an idiom that means to defeat in battle. Alternate translation: "Yahweh will cause the soldiers to be strong so that they defeat their enemies when the enemies attack their city" (See: [[rc://en/ta/man/jit/figs-idiom]])