Complex sentence: The President's Committee on Civil Rights (PCCR) was established by Executive Order 9808, which Harry Truman, who was then President of the United States, issued on December 5,1946.
Split into simpler sentences: The President's Committee on Civil Rights (PCCR) was established by Executive Order 9808, which Harry Truman. Truman was then President of the United States, issued on December 5,1946.