Complex sentence: All categories of sewage are likely to carry pathogenic organisms that can transmit disease to humans and other animals; contain organic matter that can cause odor and nuisance problems; hold nutrients that may cause eutrophication of receiving water bodies; and can lead to ecotoxicity.
Split into simpler sentences: All categories of sewage are likely to carry pathogenic organisms that can transmit disease to humans and animals. Sewage contains nutrients that may cause eutrophication of receiving water bodies; and can lead to ecotoxicity.