"500 yoke of oxen." Each yoke would have been over two oxen, so there were five hundred pairs of oxen, which is a total of one thousand (1,000) oxen. (See: [[rc://en/ta/man/jit/translate-numbers]])
The refers to places that were east of Canaan. Alternate translation: "all the people who live in lands that were east of Canaan" (See: [[rc://en/ta/man/jit/figs-explicit]])