Complex sentence: After four years of seemingly ineffective protest, the disclaimer requirement was repealed in the Fall of 1962 by President John F. Kennedy who was spurred by an incident extraneous to universities' protests.
Split into simpler sentences: After four years of seemingly ineffective protest, the disclaimer requirement was finally repealed. Repeal in Fall 1962 by President John F. Kennedy was spurred by an incident extraneous to universities' protests.