Original sentence: In recent years there have been allegations that he has been supporting a covert nuclear weapons development project in Iran, as a response to the nuclear weapons possessed by Israel and the United States.Khamenei, who was 14 years old during the Abadan Crisis, when the United States helped overthrow the elected prime minister Mohammad Mossadegh in order to regain control over Iranian oil, also maintained an aggressive stance towards Israel and the United States (and possibly other countries, which he calls by the general term the enemy)
Edited sentence: Khamenei has also maintained an aggressive stance towards Israel and the United States (and possibly other countries, which he calls by the general term the enemy), and in recent years there have been allegations that he has been supporting a covert nuclear weapons development project in Iran