Original sentence: Kennedy is the chairman of "World Mercury Project" (WMP), an advocacy group that focuses on the perceived issue of mercury,  in industry and medicine, especially the ethylmercury compound thimerosal in vaccines, proposed by anti-vaccination advocates as a mechanism for the purported link between vaccines and autism.Research has shown no link between vaccines and autism, and the removal of thimerosal from virtually all childhood vaccines had no effect on autism incidence.The scientific consensus is that vaccines do not cause autism
Edited sentence: Kennedy is the chairman of "World Mercury Project" (WMP), an advocacy group that focuses on the perceived issue of mercury,  in industry and medicine, especially the ethylmercury compound thimerosal in vaccines, proposed by anti-vaccination advocates as a mechanism for the link between vaccines and autism