Complex sentence: The Americas Society Building is a New York City landmark, is listed in the National Register of Historic Places, and was previously the Percy Rivington Pyne House before serving as the Soviet Mission to the United Nations until its current usage.
Split into simpler sentences: The Americas Society Building is a New York City landmark, is listed in the National Register of Historic Places. The buildiing was previously the Percy Rivington Pyne House before serving as the Soviet Mission to the United Nations until its current usage.