Complex sentence: Monk Bretton has been a settlement since medieval times and was originally known as just'Bretton', probably taking its name from the twelfth-century Adam fitz Swain de Bretton, whose family owned much land in the area and who also founded Monk Bretton Priory.
Split into simpler sentences: Monk Bretton has been a settlement since medieval times and was originally known as just'Bretton'. It is sometimes thought to have taken its name from from the twelfth-century Adam fitz Swain de Bretton, whose family owned much land in the area and who also founded Monk Bretton Priory.