Complex sentence: Members of the House of Habsburg were believed to be able to cure stuttering by a mouth-kiss, while the medieval monarchs of Castile were reputed to posess the ability to exorcise demons by making the sign of the cross and calling on God.
Split into simpler sentences: Members of the House of Habsburg were believed to be able to cure stuttering by a mouth-kiss. On the other hand, the medieval monarchs of Castile were reputed to posess the ability to exorcise demons by making the sign of the cross and calling on God.