Complex sentence: Hypertrophic cardiomyopathy (HCM) is one of the most uncommon cardiac malformations encountered in pediatric cardiology, largely because the presentation of symptoms is usually absent, incomplete, or delayed into adulthood.
Split into simpler sentences: Hypertrophic cardiomyopathy (HCM) is one of the most uncommon cardiac malformations encountered in pediatric cardiology. The presentation of symptoms is usually absent, incomplete, or delayed into adulthood.