Complex sentence: In the mid- 1980s, the U.S. provided Sudan with food aid, insecticides, and fertilizers but when Sudan failed to repay loans in 1985, the U.S. ceased all non-food aid.
Split into simpler sentences: In the mid- 1980s the U.S. provided Sudan with food aid, insecticides, and fertilizers. When Sudan failed to repay loans in 1985, the U.S. ceased all non-food aid.