Complex sentence: Omayra Sánchez was 13 years old at the time and lived with her parents, brother, and aunt Maria Adela Garzón in the neighborhood of Santander; prior to the tragedy, her mother had traveled to Bogotá on business.
Split into simpler sentences: Omayra Sánchez was 13 years old at the time and lived with her parents, her brother, and an aunt, Maria Adela Garzón, in the neighborhood of Santander. Prior to the tragedy, her mother had traveled to Bogotá on business.