Complex sentence: He has suffered from chronic asthma since birth, and he spent the first six months of his life in an incubator fighting the ailment, taking up boxing at the age of 12 in order to try to overcome the condition.
Split into simpler sentences: He has suffered from chronic asthma since birth, and he spent the first six months of his life in an incubator fighting the ailment. He took up boxing at the age of 12 to try to overcome the condition.