Hagar's return to Sarai and Abram is implict. You can make this more explicit. AT: "So Hagar went back and gave birth" (See: [[rc://en/ta/man/translate/figs-explicit]])
This introduces background information about Abram's age when these things happened. Your language may have a special way to mark background information. (See: [[rc://en/ta/man/translate/writing-background]])