Complex sentence: A storm, however, diverted her to the Danish island Bornholm, where the archbishop of Lund declared the wedding a violation of church law because Haakon had already been engaged to Margaret.
Split into simpler sentences: A storm, however, diverted her to the Danish island Bornholm. There, the archbishop of Lund declared the wedding a violation of church law, as Haakon had already been engaged to Margaret.