Complex sentence: The villa was damaged by fire in the 1930s and was subsequently purchased by the American heiress Barbara Hutton, who demolished it and replaced it with the existing Neo-Georgian mansion designed by Leonard Rome Guthrie of the English architectural practice Wimperis, Simpson and Guthrie.
Split into simpler sentences: The villa was damaged by fire in the 1930s and was subsequently purchased by the American heiress Barbara Hutton who demolished it. Hutton built the existing Neo-Georgian mansion designed by Leonard Rome Guthrie of the English architectural practice Wimperis, Simpson and Guthrie.