Complex sentence: On September 30,1978, Sung-Jun Kim of Korea knocked out the 4 "10" southpaw Sor Vorasingh in three rounds, making him, at nineteen years and 5 months old, the youngest fighter to ever lose a world title.
Split into simpler sentences: On September 30,1978, Sung-Jun Kim of Korea knocked out Sor Vorasingh in three rounds. At nineteen years and 5 months old, the 4 "10" southpaw Sor Vorasingh was the youngest fighter to ever lose a world title.