Complex sentence: Most of the three million dollars was paid back to foreign creditors by the United States officials in charge of Nicaraguan financial affairs, which allowed the Nicaraguan government to avoid having to pay from its internal revenue the loans it acquired from foreign banks.
Split into simpler sentences: Most of the three million dollars was paid back to foreign creditors by the United States officials in charge of Nicaraguan financial affairs. This allowed the Nicaraguan government to avoid having to pay from its internal revenue the loans it acquired from foreign banks.