Complex sentence: The Eugenics Record Office (ERO), located in Cold Spring Harbor, New York, United States, was a research institute that gathered biological and social information about the American population, serving as a center for eugenics and human heredity research from 1910 to 1939.
Split into simpler sentences: The Eugenics Record Office (ERO) was a collection service that gathered information about the American population's genetics. It was established by the Carnegie Institution of Washington's Station for Experimental Evolution, and subsequently, its Department of Genetics, located in Cold Spring Harbor, New York, United States was a center for eugenics and human heredity research from 1910 to 1939.