Complex sentence: The Gruzino estate near Novgorod was constructed by Russian architect Vasily Petrovich Stasov for Count Alexey Arakcheyev in the 1810s.
Split into simpler sentences: The Gruzino estate near Novgorod was built by Russian architect Vasily Petrovich Stasov. Stasov built it for Count Alexey Arakcheyev in the 1810s.