Complex sentence: Damp grottoes were cool places to retreat from the Italian sun, but they also became fashionable in the cool drizzle of the Île-de-France; near Moscow, at Kuskovo the Sheremetev estate there is a handsome Summer Grotto, built in 1775.
Split into simpler sentences: Damp grottoes were cool places to retreat from the Italian sun, but they also became fashionable in the cool drizzle of the Île-de-France. In Kuskovo at the Sheremetev estate there is a Summer Grotto, built in 1775.