3. The Great Fire of London broke out in 1666. It destroyed a large part of the city.
The Great Fire of London which destroyed a large part of the city broke out in 1666
4. My sister bought a new car last month. The car has broken down four times already.
The car that my sister bought last month has broken down four times already
5. Van Gogh cut off his ear. He was a well-known writer.
Van Gogh who was a well-known writer cut off his ear
6. My father had an operation for his heart problem. The problem was a partial success.
The operation which my father had for  his heart problem was a partial success
7. You recommended a film. We went to see the film, but we didn't think much of it.
We went to see the film that you recommended, but we didn't think much of it.
8. My daughter brings friends home. Some of the friends look as though they never wash.
Some of the friends that my daughter brings home look as though they never wash.
9. David is going to talk about careers. I'm sure you all know him.
David, whom I'm sure you all know, is going to talk about careers
10. You didn't recognize an actor on television last night. The actor was Kieer Sutherland.
The actor that you didn't recognize on television last night was Kieer Sutherland.
11. Mark wrote an essay while we were on holiday. It has won a prize in the school competition.
The essay that Mark wrote while we were on holiday has won a prize in the school competition
12. That is the woman. I was telling you about her.
That is  the woman whom I was telling you about