Complex sentence: Quintana's family moved to the Bronx sector of New York when he was only two weeks old; here he went to school and whilst he was still in high school he formed a band with his neighborhood friends.
Split into simpler sentences: Quintana's family moved to the Bronx sector of New York when he was only two weeks old. There he went to school and while he was in high school he formed a band with his neighborhood friends.