Complex sentence: It was the location for Sigmund Freud's famous "Clark Lectures" in 1909, introducing psychoanalysis to the U.S. Clark celebrated the centennial of the visit in October 2009.
Split into simpler sentences: It was the location for Sigmund Freud's famous "Clark Lectures" in 1909, introducing psychoanalysis to the US. The university celebrated the centennial of the visit in October 2009.