The word "they" refers to the four foreign kings who were attacking the region of Canaan. Their names were Amraphel, Arioch, Chedorlaomer, and Tidal. AT: "they turned and went" (See: [[rc://en/ta/man/translate/figs-go]])
The city of Bela was also called Zoar. This information could also be put at the end of the sentence. "the king of Bela went out and prepared for battle. Bela is also called Zoar."
"joined battle" or "drew up battle lines." Some translators may need to also say that the armies fought, as the UDB does in verse 9. (See: [[rc://en/ta/man/translate/figs-explicit]])