Original: He was a staunch critic of biocentric philosophies such as deep ecology and the biologically deterministic beliefs of sociobiology, and his criticisms of "new age" Greens such as Charlene Spretnak contributed to the divisions that affected the American Green movement in the 1990s.
Simplified: His criticisms of "new age" Greens such as Charlene Spretnak contributed to the divisions in the American Green movement in the 1990s.