Complex sentence: Kenneth Clark became the first African American tenured full professor at the City College of New York in 1942, and later was the first African American on the New York State Board of Regents and the first African American to be president of the American Psychological Association.
Split into simpler sentences: Kenneth Clark became the first African-American tenured full professor at the City College of New York in 1942. He was the first African American on the New York State Board of Regents and the first African American to be president of the American Psychological Association.