Johan Saint-Luc has signed five-year deal with Barcelona.

Is Jones the latest signee from Barcelona?

I am confused with those sentences. I am confused with the words because they seem so muddled. Can I understand if both sentences are correct or not? Is there any difference if both are correct?

Is Marie Curie the only person to

win a Nobel Prize in two different disciplines?

3) Marie Curie is the only person of the world to have won, at least twice,

two nationalities.