Complex sentence: USCF was founded and incorporated in Illinois on December 27,1939, from the merger of two regional chess organizations and is currently a 501 (c) (3) non-profit organization headquartered in Crossville, Tennessee.
Split into simpler sentences: USCF was founded and incorporated in Illinois in 1939, from the merger of two regional chess organizations. It is a 501 (c) (3) non-profit organization headquartered in Crossville, Tennessee.