1.He worked for a woman.She used to be an artist
=> He worked for a woman who used to be an artist.
2.They called a doctor.He lived nearby
=> They wholived nearby called a doctor
3.I wrote an email to my sister.She lives in Italy
=> I wrote an email to my sister, who lives in Italy
4.Linh liked the waiter.He was very friendly
=> Linh liked the waiter who was very friendly
5. We broke a car.It belonged to my uncle
=> We broke a car which belonged to my uncle