Complex sentence: Jordan offered to make the exchange, but demanded "proof of life" first, this wasn't done, and the video of the pilot's execution was released, the terrorists, Sajida al-Rishawi and Ziad al-Karbouli, were executed.
Split into simpler sentences: Jordan offered to make the exchange, but demanded "proof of life" first. When video of the pilot's execution was released, the fighters, Sajida al-Rishawi and Ziad al-Karbouli, were executed.