Complex sentence: The Potters were deep in hiding through the Fidelius Charm, but on 31 October, 1981, the Potters'whereabouts were betrayed by their friend Peter Pettigrew, and they were attacked without warning at their home in Godric's Hollow.
Split into simpler sentences: The Potters were deep in hiding through the Fidelius Charm, but on 31 October, 1981, the Potters'whereabouts were betrayed by their friend Peter Pettigrew. They were attacked without warning at their home in Godric's Hollow.