Complex sentence: Mark was born in Boston, Massachusetts in 1974, however, he was raised in the Orlando, Florida suburb of Oviedo, where he attended St. Luke's School and graduated from Oviedo High School.
Split into simpler sentences: Mark was born in Boston, Massachusetts in 1974. He would, however, be raised in the Orlando, Florida suburb of Oviedo, where he attended St. Luke's School and graduated from Oviedo High School.