Complex sentence: Potassium iodide (KI) tablets can reduce the risk of cancer in some situations due to slower uptake of ambient radioiodine, but they do not prevent acute radiation syndrome as they provide no shielding from other environmental radionuclides.
Split into simpler sentences: Potassium iodide (KI) tablets can reduce the risk of cancer in some situations due to slower uptake of ambient radioiodine. They do not prevent acute radiation syndrome as they provide no shielding from other environmental radionuclides.