Complex sentence: Some find it unhelpful to use the term'Roman Catholic' to distinguish the churches or dioceses in full communion with the pope, because they all have their own cultural nuances that are not Roman in nature.
Split into simpler sentences: Some find it unhelpful to use the term'Roman Catholic' to distinguish the churches or dioceses in full communion with the pope. Dioceses or churches in communion with the See of Rome have their own cultural nuances that are not Roman in nature.