Complex sentence: During a physical examination to check for MG, a doctor might ask the potentially affected person to look at a fixed point for 30 seconds and to relax the muscles of their forehead.
Split into simpler sentences: During a physical examination to check for MG, a doctor might ask to preform repetitive movements. For instance the doctor may ask to look at a fixed point for 30 seconds and to relax the muscles of their forehead.