Assuming this to be "être composé à parité [de/par]", it could be translated as "composed equally [of]", as in the following example:

The viva voce examining board designated by the two institutions will be ***composed equally of*** scientists from the two countries and will consist of at least four members including the two thesis supervisors.
Le jury de soutenance désigné par les établissements partenaires est ***composé à parité*** par des représentants scientifiques des deux pays. Il comprend au moins quatre membres dont les deux directeurs de thèse.
www.anu.edu.au/graduate/current/forms/convention.pdf