Original sentence: High schools are addressing this behaviour.In schools, though sexual harassment initiateded by students is most common, it can also be perpetrated by teachers or other school employees, and the victim can be a student, a teacher, or other school employee
Edited sentence: High schools are addressing the behaviour.In schools, sexual harassment can be perpetrated by teachers, other school employees, or by students; and, the victim can be a student, a teacher, or other school employee