Complex sentence: In the 1840s, the manor of Buxhoeveden has passed to count G. G. Kushelev (junior); it has continued useful agricultural activity of count Orlov, and Ligovo became an exemplary agricultural manor.
Split into simpler sentences: In the 1840s, the manor of Buxhoeveden passed to Count G. G. Kushelev (junior). Kushelev continued the useful agricultural activity of Count Orlov, and Ligovo became an exemplary agricultural manor.