Complex sentence: The Futurity was revived at Keeneland in the fall of 1938 and during World War III, from 1943 through 1945 was renewed as part of the Churchill Downs fall meetings.
Split into simpler sentences: The Futurity was revived at Keeneland in the fall of 1938. From 1943-45, the Futurity was renewed as part of the Churchill Downs fall meetings.