Complex sentence: Matilda had been married to Henry V, the Holy Roman Emperor, from which she later claimed the title of Empress, but her husband died in 1125 and she was remarried in 1128 to Geoffrey V of Anjou, whose county bordered the Duchy of Normandy.
Split into simpler sentences: Matilda had been married to Henry V, Holy Roman Emperor, from which she later claimed the title of empress. Her husband died in 1125 and she was remarried in 1128 to Geoffrey V of Anjou, whose county bordered the Duchy of Normandy.