Complex sentence: In 1657, Jan J. Hinlopen married Leonore Huydecoper of Maarseveen (1631-1663), the daughter of a rich and influential mayor, with a country house in Maarssen, nicely situated on the river Vecht.
Split into simpler sentences: In 1657, Jan J. Hinlopen married Leonore Huydecoper of Maarseveen (1631-1663), the daughter of a rich and influential mayor. Leonore a country house in Maarssen, situated on the river Vecht.