Complex sentence: Princess Elizabeth was betrothed in 1562 to Christopher, the third son of Albert VII, Duke of Mecklenburg-Güstrow, but soon after, he was captured and held hostage for several years, and the engagement was considered to be broken.
Split into simpler sentences: Princess Elizabeth was betrothed in 1562 to Christopher, the third son of Albert VII, Duke of Mecklenburg-Güstrow. Soon after, however, he was captured and held hostage for several years, and the engagement was considered to be broken.