Last month my mother came back the village to visit my grandparents. ( Make question ) The woman owned the luxury hotel. You met her at the party yesterday. ( Combine sentence with relative pronoun )

When did you mother come back to the village to visit your grandparents ?

The woman who you met at the party yesterday was owned the luxury hotel.  

Last month my mother came back the village to visit my grandparents. ( Make question )

→ Why did your mother come back the village ?

The woman owned the luxury hotel. You met her at the party yesterday. ( Combine sentence with relative pronoun )

→ The woman whom you met at the party yesterday owned the luxury hotel.