Complex sentence: Fernand Arnout (December 8,1899--January 30,1974) was a French weightlifter who competed in the 1920 Summer Olympics and in the 1928 Summer Olympics.
Split into simpler sentences: Fernand Arnout (December 8,1899--January 30,1974) was a French weightlifter. He competed in the 1920 Summer Olympics and in the 1928 Summer Olympics.