Complex sentence: If the athlete is uncomfortable with having Athlete's Heart or if a differential diagnosis is difficult, deconditioning from exercise for a period of three months will allow the heart will return to its regular size.
Split into simpler sentences: If the athlete is uncomfortable with having Athlete's Heart or a differential diagnosis is difficult, typical treatment is deconditioning the athlete from exercise for a period of three months. During this time, the heart will return to its regular size.