Complex sentence: The information in this book is largely derived from a three-year study amongst 80 children and adolescents who were interviewed about their experiences; children who ranged in age from 8 to 19 years at first contact.
Split into simpler sentences: The information in this book is largely derived from a three-year study amongst 80 children and adolescents who were interviewed about their experiences. The children ranged in age from 8 to 19 years at first contact.