Complex sentence: Muncaster Castle is currently owned by the Pennington family, who have lived at Muncaster for at least 800 years, the land being granted to Alan de Penitone in 1208.
Split into simpler sentences: Muncaster Castle is currently owned by the Pennington family, who have lived at Muncaster for at least 800 years. The Muncaster estate was granted to Alan de Penitone in 1208.