Complex sentence: Under Eynsham Abbey Thames Ditton had been parceled with Esher, and it was in the Saxon's Elmbridge hundred, where its local wealthy, wise and powerful would convene for strategic purposes.
Split into simpler sentences: Under Eynsham Abbey, Thames Ditton had been parceled with Esher. It was in the Saxon's Elmbridge hundred, where its local wealthy, wise and powerful would convene for strategic purposes.