Complex sentence: Contrary to popular belief there was no cyanide gas attached to the bomb, although Yousef had consider adding cyanide to the bomb, and is said to have regretted not doing so in Peter Lance's book 1000 Years For Revenge.
Split into simpler sentences: Contrary to popular belief there was no cyanide gas attached to the bomb. Although Yousef had consider adding to the bomb, and is said to have regret not doing so in Peter Lance's book 1000 Years For Revenge.