Complex sentence: He was often referred to by his cardiologists as a medical miracle owing to the fact that he survived with a large PDA into his sixth decade as statistically survival for patients with this condition is less than 10% beyond their 40s.
Split into simpler sentences: He was often referred to by his cardiologists as a medical miracle owing to the fact that he survived with a large PDA into his sixth decade. Statistically survival for patients with this condition is less than 10% beyond their 40s.