Complex sentence: The family lived at 2 West 52nd Street in Manhattan, one of three houses of the Vanderbilt Triple Palace which were built during the 1880s for William Henry Vanderbilt and his two daughters.
Split into simpler sentences: The family lived at 2 West 52nd Street in Manhattan, one of three houses in the Vanderbilt Triple Palace. The houses were built in the 1880s for William Henry Vanderbilt and his two daughters.