Complex sentence: After turning down Henry's proposal, in 1541 she married François, Duc de Bar, who succeeded his father as Duc de Lorraine in 1544 and died in 1545, leaving Christina Regent of Lorraine.
Split into simpler sentences: After turning down Henry's proposal, in 1541 she married François, Duc de Bar. Francis succeeded his father as Duc de Lorraine in 1544 and died in 1545, leaving Christina Regent of Lorraine.