Complex sentence: Some kinds of "Azotobacter" can also biodegrade chlorine-containing aromatic compounds, such as 2,4,6-trichlorophenol, which was previously used as an insecticide, fungicide, and herbicide, but later was found to have mutagenic and carcinogenic effects.
Split into simpler sentences: Some kinds of "Azotobacter" can also biodegrade chlorine-containing aromatic compounds, such as 2,4,6-trichlorophenol. The latter was previously used as an insecticide, fungicide, and herbicide, but later was found to have mutagenic and carcinogenic effects.