Complex sentence: Saudi Arabia has not officially preserved and possessed weapons of mass destruction (WMD), and has signed in April 1972 and approved in May 1972 for the convention on the prohibition of the development, production and stockpiling of biological (bacteriological) and toxin weapons.
Split into simpler sentences: Saudi Arabia has not officially preserved and possessed weapons of mass destruction (WMD). In truth, and has signed in April 1972 and approved in May 1972 for the convention on the prohibition of the development, production and stockpiling of biological (bacteriological) and toxin weapons.