Complex sentence: She owned a grand villa that took up the entire block in the city of Pompeii and it is documented by researchers as being well furnished and decorated until it was ruined in a terrible earthquake of 62 A.D. that caused much damage.
Split into simpler sentences: She owned a grand villa that took up the entire block in the city of Pompeii. Her villa is documented by researchers as being well furnished and decorated until it was ruined in a terrible earthquake of 62 A.D. that caused much damage.