Complex sentence: They typically have improved bioavailability relative to thiamine itself, and are used to treat conditions such as vitamin B 1 deficiency (including beriberi, Korsakoff's syndrome, and Wernicke's encephalopathy) and diabetic neuropathy.
Split into simpler sentences: They typically have improved bioavailability relative to thiamine itself, and are used to treat conditions caused by vitamin B 1 deficiency. These conditions include beriberi, Korsakoff's syndrome, Wernicke's encephalopathy and diabetic neuropathy.