Complex sentence: Lichtenstein was appointed to the NYC Economic Development Corporation's board of directors in 2015 by Bill de Blasio and is on the board of governors of the Real Estate Board of New York.
Split into simpler sentences: Lichtenstein was appointed to the NYC Economic Development Corporation's Board of Directors in 2015 by Bill de Blasio. He is also on the Board of Governors of the Real Estate Board of New York.