they're the ones who
They did it.
C'est eux qui étaient venus te chercher.
They were the ones who had come to pick you up.
— L’Enfance d’Ivan (1962)
They started it.
C'est eux qui seront notre armée.
They will be our army.
C'est eux qui m'ont sauté dessus.
They were the ones who jumped on me.
C'est eux qui ont trouvé les fonds.
They’re the ones who found the funding.
— Le Patient anglais (1996)
They were the ones who came up with the idea.