Use of these compounds has been restricted or banned in many countries, because of their nonselective toxicity.
The main use for thallium, rat poison, was banned in many countries in the 1970s.The use of thallium as a poison has been reduced or banned in many countries because these countries think that thallium might cause cancers.
The main use for thallium, rat poison, was banned in many countries in the 1970s.The use of thallium as a poison has been reduced or banned in many countries because these countries think that thallium might cause cancers.
Rewrite the sentence to be simpler: Use of these compounds has been restricted or banned in many countries, because of their nonselective toxicity. Output: