Original sentence: A disturbingly typical event of this sort is the use of a gun to effect multiple killings in a school setting, such as the Columbine massacre.Although the United States certainly has an unusually high number of killings of children by other children, it is most often the case that the perpetrators and victims are teenagers, not children.In many such cases, the youthful perpetrator is tried as an adult for their crime
Edited sentence: The United States has an unusual level of killings of children by other children, often in multiple gun killings such as the Columbine massacre.These killings have led to a number of reactions in the United States in attempts to reduce the number of similar killings in the future