Simplify the following text for a Grade 9 native English-speaking person.
Original: Godwinson was subsequently defeated within a month by another Viking descendant , William , Duke of Normandy ( Normandy had been conquered by Vikings ( Normans ) in 911 ) .
Simplified: Harold Godwinson was subsequently defeated within a month by William , Duke of Normandy , who was another descendant of Vikings . Normandy had been acquired by Normans ( Norsemen ) in 911 .