Complex sentence: In 1243, the former Imperial estates were given in pawn to the Wettin margrave Henry III of Meissen, his grandson Margrave Frederick I of Meissen occupied Colditz Castle in 1309.
Split into simpler sentences: In 1243, the former Imperial estates were pledged to the Wettin margrave Henry III of Meissen. His grandson, Margrave Frederick I of Meissen occupied Colditz Castle in 1309.