Complex sentence: In 1962 the estate (considerably reduced in size to 150 acres) was bought by a descendant of the Frasers of Gortuleg; this later generation laird wrote a booklet in 1990- "A History of Guisachan, by Donald Fraser".
Split into simpler sentences: In 1962 the estate (considerably reduced in size to 150 acres) was bought by a descendant of the Frasers of Gortuleg. In 1990, this later generation laird wrote a booklet- "Guisachan, A History by Donald Fraser".