Complex sentence: The Vlachs converted to Orthodox Christianity and adopted a Slavonic liturgy in contrast with the Hungarians, Hungarian-speaking Székelys and Saxons who settled in the intra-Carpathian region in the 10th to 12th centuries and adhered to Catholicism.
Split into simpler sentences: The Vlachs converted to Orthodox Christianity and adopted a Slavonic liturgy. In contrast with them, the Hungarians, Hungarian-speaking Székelys and Saxons who settled in the intra-Carpathian region in the 10th to 12th centuries adhered to Catholicism.