Learn French: Après son retour, nous parlerons. - After his return, we will talk.

The futur antérieur is used when a temporal conjunction (like quand or dès que) is followed by a subject and a verb. Here, après is acting as a preposition followed directly by a noun phrase (son retour), not a full clause with a verb. Since there is no verb in the first half of the sentence, there is no need for the futur antérieur.

How could I rewrite this sentence to use the futur antérieur like in the rest of the lesson?

You would need to change the noun (son retour) into a full clause with a subject and a verb. For example, using quand (when) or dès que (as soon as) and the verb rentrer (to return): Quand il sera rentré, nous parlerons (When he has returned, we will talk).

The translation says 'his return'. Could son retour also mean 'her return'?

Absolutely. In French, possessive adjectives like son, sa, and ses agree with the gender of the noun being owned, not the owner. Because retour is a masculine noun, we must use son, regardless of whether a man or a woman is returning.

Why do we use après here instead of après que?