Complex sentence: Most of the members of the organisation were part of liberal professions (lawyers, writers and merchants) and did not object to the Joseph II's reforms in principle, but because they had been levied on the territories without consultation.
Split into simpler sentences: Most of the members of the organisation came from the liberal professions (such as lawyers, writers and merchants). Most were moderates who did not object to Joseph II's reforms in principle but because they had been levied on the territories without consultation.