Complex sentence: Shotaro Makisumi (commonly known as "Macky", born March 21,1990 in Ube, Yamaguchi, Japan), is best known for setting several world records for speedcubing, or quickly solving the Rubik's Cube.
Split into simpler sentences: Shotaro Makisumi (commonly known as "Macky") was born on March 21,1990, in Ube, Yamaguchi, Japan. He is best known for setting several world records for speedcubing, or quickly solving the Rubik's Cube.