Let's break it down:
* Ils: They (masculine plural pronoun)
* souhaitent: Wish (verb in the present tense)
* harmoniser: To harmonize (verb)
This phrase implies that a group of people wants to create a unified or consistent approach to something. The exact meaning will depend on the context. For example:
* Ils souhaitent harmoniser les politiques fiscales. (They wish to harmonize tax policies.)
* Ils souhaitent harmoniser les procédures de travail. (They wish to harmonize work procedures.)
* Ils souhaitent harmoniser les couleurs de la décoration. (They wish to harmonize the colors of the decoration.)