Complex sentence: The term'Chronic paroxysmal hemicrania' was first used in 1976 by Sjaastad to describe the condition of two of their patients who were experiencing repeated solitary and limited (paroxysmal) daily headache attacks on only one side of the cranium (hemicrania).
Split into simpler sentences: The term'Chronic paroxysmal hemicrania' was first used in 1976 by Sjaastad to describe the condition of of two of their patients who were experiencing repeated daily headache attacks that were described as solitary and limited (paroxysmal). The patients were experiencing unilateral headaches that remained on only one side of the cranium (hemicrania).