Complex sentence: In 1066 the Normans invaded south-east England, defeating the English forces at the battle of Hastings: in the aftermath of the victory, William the Conqueror entrusted the conquest of the south-west of England to his half-brother Robert of Mortain.
Split into simpler sentences: In 1066 the Normans invaded south-east England, defeating the English forces at the battle of Hastings. In the aftermath of the victory, William the Conqueror entrusted the conquest of the south-west of England to his half-brother Robert of Mortain.