Complex sentence: Ghotbzadeh was a supporter of the National Front of Iran and the Freedom Movement of Iran and was a close aide of Ayatollah Khomeini when Khomeini was in exile in France.
Split into simpler sentences: Ghotbzadeh was a supporter of the National Front of Iran. Later he became a close aide of Ayatollah Khomeini when Khomeini was in exile in France.