"Ea mi-a explicat cultura ei."

Translation: She explained her culture to me.

[cptlangstrumpf]

Can not ei also be "their culture". If in a previous sentence they were talking about someone else.

[razvan.marin]

Ei here is always her, same as lui would be his and lor would be their.

It is true that if in the previous sentece they were talking about someone else it could be some other her rather than the one who explained as you noted.

[cptlangstrumpf]

Ok thank you.