Complex sentence: Originally the estate belonged to the Frasers, then the Hays starting in 1413, but eventually property of the Earl Marischal; over the years Ury has been rebuilt three times.
Split into simpler sentences: Originally the estate belonged to the Frasers, then the Hays starting in 1413, but eventually became the property of the Earl Marischal. Over the years Ury has been rebuilt three times.