Complex sentence: He grew up in Lorain, Ohio til he was 9 years old, because of his asthma, he then moved to South Tampa, Florida, where he attended H.B. Plant High School.
Split into simpler sentences: He grew up in Lorain, Ohio til he was 9 years old. Because of his asthma he then moved to South Tampa, Florida, where he attended H.B. Plant High School.