Complex sentence: Supplements should be used with caution after consulting a physician, because iron can accumulate in the body and cause damage to organs; this is particularly true of anyone with hemochromatosis, a relatively common condition that can remain undiagnosed.
Split into simpler sentences: Supplements should be used with caution after consulting a physician, because iron can accumulate in the body and cause damage to organs. This is particularly true of anyone with hemochromatosis, a relatively common condition that can remain undiagnosed.