Complex sentence: Erasto B. Mpemba (born 1950) is an Tanzanian scientist noted for the Mpemba effect, the hot-begets-cold-quicker phenomenon, which he discovered at the age of about thirteen, in 1963, while making ice cream.
Split into simpler sentences: Erasto B. Mpemba (born 1950) is a Tanzanian scientist, who discovered the Mpemba effect, the hot-begets-cold-quicker phenomenon. He made the discovery at the age of about thirteen, in 1963, while making ice cream.