Complex sentence: Following the defeat of the large forces and the dispersal of their reminants into small units, the number of insurgents declined from 120,000 in 1933, to 50,000 in 1934; 40,000 in 1935; 30,000 in 1936; and 20,000 in 1937.
Split into simpler sentences: Following the defeat of the large forces and the dispersal of their reminants into small units. Their numbers declined from 120,000 in 1933, to 50,000 in 1934; 40,000 in 1935; 30,000 in 1936; and 20,000 in 1937.