Complex sentence: She married Henry II, Duke of Lorraine on 24 April 1606, he had previously been married Catherine of Navarre but Henry and Catherine where divorced because the marriage unhappy, childless and Catherine had refused to convert to the Roman Catholic faith.
Split into simpler sentences: She married Henry II, Duke of Lorraine on 24 April 1606. He had previously been married Catherine of Navarre but Henry and Catherine where divorced because the marriage unhappy, childless and Catherine had refused to convert to the Roman Catholic faith.