Original sentence: The plan was later complicated in late 1985, when Lieutenant Colonel Oliver North of the National Security Council diverted a portion of the proceeds from the Iranian weapon sales to fund the Contras, a group of anti-Sandinista rebel fighters, in their struggle against the socialist government of Nicaragua
Edited sentence: The plan was later complicated in late 1985, when Lieutenant Colonel Oliver North of the National Security Council diverted a portion of the proceeds from the Iranian weapon sales to fund the Contras, a group of anti-Sandinista United States backed death squad, in their struggle against the socialist government of Nicaragua