Complex sentence: Modern research into low intensity electrical stimulation of the brain was begun by Leduc and Rouxeau in France (1902); in 1949, the Soviet Union expanded research of CES to include the treatment of anxiety as well as sleeping disorders.
Split into simpler sentences: Modern research into low intensity electrical stimulation of the brain was begun by Leduc and Rouxeau in France (1902). In 1949, the Soviet Union expanded research of CES to include the treatment of anxiety as well as sleeping disorders.