Simplify the following text for a Grade 5 native English-speaking person.
Original: From 1728 until 1737 he was Duke of Lorraine , but lost this title when Lorraine was seized by France in the War of the Polish Succession ; he was compensated with Tuscany in the peace treaty that ended that war .
Simplified: From 1728 until 1737 he was Duke of Lorraine , but lost Lorraine when he had to give it to France .