Original sentence: However, this exchange never took place, and after 444 days of captivity, embassy employees were finally allowed to leave Iran and return to the United States on the basis of Algiers declaration but U.In contrast U.Iran's relations with the United States were severely strained after the revolution, especiallly when Iranian students seized US embassy personnel on November 4, 1979, labeling the embassy a "Den of Spies" and accused its personnel of being CIA agents trying to overthrow the revolutionary government, similiar to what they did against Mohammad Mossadegh in 1953.blocked  Despite attempts made by the administration of US President Jimmy Carter at negotiation and rescuing the remaining hostages through such methods as Operation Eagle Claw, Iran refused to release them and threatened to put the hostages on trial for espionage.hasn't released the properties of Iran
Edited sentence: Despite attempts made by the administration of US President Jimmy Carter at negotiation and rescuing the remaining hostages through such methods as Operation Eagle Claw, Iran refused to release them and threatened to put the hostages on trial for espionage.However, this exchange never took place, and after 444 days of captivity, embassy employees were finally allowed to leave Iran and return to the United States.Iran's relations with the United States were severely strained after the revolution, especiallly when Iranian students seized US embassy personnel on November 4, 1979, labeling the embassy a "Den of Spies" and accused its personnel of being CIA agents trying to overthrow the revolutionary government