Leurs conjointes, Mme X, Mme Y et Mme Z forment un groupe non lié qui contrôle ZYX ltée.

Could you please translate this to English?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Their spouses, Mrs. X, Mrs. Y and Mrs. Z are an unrelated group that controls ZYX Co.