Complex sentence: The waste which is formed is toxic and difficult to deal with, and the process is banned in many countries because in 2006, Trafigura used the process and then dumped the waste in Africa.
Split into simpler sentences: The waste which is formed is toxic and difficult to deal with, and the process is banned in many countries because of this. In 2006, Trafigura used the process and then dumped the waste in Africa.