Complex sentence: It is increasingly thought that alterations to interal bacteria can contribute to inflammatory gut diseases IBD affected individuals have been found to have 30-50 percent reduced biodiversity of commensalism bacteria such as a decrease in Firmicutes (namely Lachnospiraceae) and Bacteroidetes.
Split into simpler sentences: It is increasingly thought that alterations to enteral bacteria can contribute to inflammatory gut diseases. IBD-affected individuals have been found to have 30-50 percent reduced biodiversity of commensal bacteria, such decreases in Firmicutes (namely Lachnospiraceae) and Bacteroidetes.