Original sentence: However, collectivization triggered a bitter struggle of many peasants against the authorities, which resulted in famine and possibly millions of casualties, particularly in Ukraine.Soviet agriculture, which had been exploited to finance the industrialization drive, continued to show poor returns throughout the decade.Under Stalin, who replaced the New Economic Policy (NEP) of the 1920s with five year plans (introduced in 1928) and collective farming, the Soviet Union was transformed from a peasant society to a major world industrial power by the end of the 1930s
Edited sentence: Collectivization took place after a struggle between authorities and kulaks