Complex sentence: It is accepted that various factors can affect the bowel's permeability, but the likely result of this is limited to temporary, mild, local inflammation; in extreme cases the result can be ulcers in the bowel lining.
Split into simpler sentences: It is accepted that various factors can affect the bowel's permeability, but the likely result of this is limited to temporary, mild, local inflammation. In extreme cases the result can be ulcers in the bowel lining.