Complex sentence: Sir Hugh de Courtenay (12 July 1303--2 May 1377), 10th Earl of Devon and 2nd Baron Courtenay, played an important role in the Hundred Years War in the service of Edward III. His chief seat was Tiverton Castle.
Split into simpler sentences: Sir Hugh de Courtenay (12 July 1303--2 May 1377) was the 10th Earl of Devon and 2nd Baron Courtenay. He played an important role in the Hundred Years War in the service of King Edward III. His chief seat was Tiverton Castle.