Complex sentence: To justify its position, Iran has refered to previous accords between the West and the late Shah of Iran regarding Eurodif and Bushehr and with other countries like North Korea or Libya, where agreements reached and promises made have not been kept.
Split into simpler sentences: To justify its position, Iran has referred to previous accords concluded between the late Shah of Iran and the West regarding Eurodif and Bushehr. They have also referred to accords between the West and other countries like North Korea or Libya, where agreements reached and promises made have not been kept.