1. Professor Wilson is an excellent lecturer. He teaches Chemistry.
​=> Professor Wilson, who teaches Chemistry, is an excellent lecturer.

2. The man is a famous actor. You met him at the party last night.
=> ​The man (whom) you met at the party last night is a famous actor.

3. There are some words. They are very difficult to translate.
=> ​There are some words (which) are very difficult to translate.

4. The student writes well. I read her composition.
​=> The student, whose composition I read, writes well.

5. Jim’s sister is a famous architect. You met her yesterday.
=> ​Jim’s sister, (whom) you met yesterday, is a famous architect.

6. I received two job offers. I accepted neither of them.
​=> I received two job offers, neither of which I accepted.

7. I was looking for a book this morning. I’ve found it now.
​=> I’ve found the book (which) I was looking for this morning.