tn The Hebrew text has the article prefixed to the noun. Here the article indicates the generic use of the word אָדָם (’adam): “humankind.”
tn This disjunctive clause (conjunction + subject + verb) is circumstantial to the initial temporal clause. It could be rendered, “with daughters being born to them.” For another example of such a disjunctive clause following the construction וַיְהִיכִּי (vayéhiki, “and it came to pass when”), see 2 Sam 7:1.
tn The pronominal suffix is third masculine plural, indicating that the antecedent “humankind” is collective.