Complex sentence: A commemorative bronze plaque was placed inside the building in 1964 by the Native New Yorkers Historical Society and New York Life Insurance, and the house was designated a National Historic Landmark on January 12,1965.
Split into simpler sentences: A commemorative bronze plaque was placed inside the building in 1964 by the Native New Yorkers Historical Society and New York Life Insurance. The house was designated a National Historic Landmark on January 12,1965.