Complex sentence: The party is the result of the "Fryske beweging", a movement of people who advocated the importance of the specific Frisian language, sports and culture and rebuked the stance of the reformed churches who advocated that sermons should only be delivered in Dutch.
Split into simpler sentences: The party is the result of the "Fryske beweging", a movement of people who advocated the importance of the specific Frisian language, sports and culture. They also critisised the reformed churches which advocated that sermons should only be delivered in Dutch.