Was Benjamin born before or after Jacob returned from Paddan Aram?
Benjamin was born after Jacob returned from Paddan Aram to Canaan. According to the context, Jacob came back with his eleven sons, and ten years later Rachel died in childbirth with Benjamin. So Benjamin's birth occurred after the return, not before.
Les explains that Jacob went up to Paddan Aram, where Abraham's relatives had been left off years earlier. After 20 years, Jacob came back with all of his children, all 11 sons. Les notes that Benjamin will be born after he comes back. Jacob returned with his two wives, Rachel and Leah, and their handmaids' children, bringing 11 sons. Then 10 years after Jacob had come back to the land of Canaan, Rachel died in childbirth with Benjamin. So Benjamin's birth clearly followed Jacob's return from Paddan Aram.