Complex sentence: Myers set the world quarter-mile record while running the final 120 yards without his right shoe, and finished another race that he won running sideways, in conversation with a runner who had boasted that he would defeat Myers.
Split into simpler sentences: Myers set the world quarter-mile record while running the final 120 yards without his right shoe. He finished another race that he won running sideways, in conversation with a runner who had boasted that he would defeat Myers.