Complex sentence: Edwin suppressed the West Saxons in a military expedition, accepted Christian teaching for himself and was baptised with other members of his family and court by Paulinus of York, a member of the Gregorian mission.
Split into simpler sentences: Edwin suppressed the West Saxons in a military expedition. He then accepted Christian teaching for himself and was baptised with other members of his family and court by Paulinus of York, a member of the Gregorian mission.