Complex sentence: These tasks were not successfully carried out during this time, with the combined output of the state-run, cooperative, and joint state-private ownership economies dropping national income from 21.3% in 1952 to 8.3% in 1957.
Split into simpler sentences: These tasks were not successfully carried out during this time. The combined output of the state-run, cooperative and joint state-private ownership economies dropped national income from 21.3% in 1952 to 8.3% in 1957.