Complex sentence: The only suspected cases to arise thus far have been vCJD with cases in the UK and Canada, moreover there are fears--based on animal studies--that consuming beef or beef products containing prion particles can also cause the development of classic CJD.
Split into simpler sentences: The only suspected cases to arise thus far have been vCJD with cases in the UK and Canada. But there are also fears--based on animal studies--that consuming beef or beef products containing prion particles can also cause the development of classic CJD.