Question

They said that he was the best student in his group

He

The girl's mother used to work with mine.

That's the girl

Answer 1

They said that he was the best student in his group

He was said to be the best student in his group

The girl's mother used to work with mine.

That's the girl whose mother used to work with mine.

Answer 2

He was said to be the best student in his group

That's the girl whose mother used to work with mine.

Answer 3

He was said to be the best student in his group.

 That's the girl whose mother used to work with mine.