Complex sentence: The fight against polio did not really get under way until 1938 when the National Foundation for Infantile Paralysis was born, headed by Basil O'Connor, the former law partner of President Roosevelt, the U.S.'s most famous polio victim.
Split into simpler sentences: The fight against polio did not really get under way until 1938 when the National Foundation for Infantile Paralysis was born. The Foundation was headed by Basil O'Connor who was the former law partner of President Roosevelt, the U.S.'s most famous polio victim.