Complex sentence: The Royal House of Benares is of an ancient Gautam Brahmin clan dating to the year 1000, that originated from Gangapur near Benares.
Split into simpler sentences: The Royal House of Benares is of an ancient Brahmin clan dating to the year 1000. Of the Gautam subcaste of Bhuinhar Brahmins, the family originated from Gangapur near Benares.