When it comes to promoting diversity in schools teachers play a big role in influencing it among their students
When it comes to promoting diversity in schools, teachers have to play a big role in those efforts.Teachers can promote it by making sure there is equal access to opportunities that can help students to focus and fully participate in opportunities that can better their learning process
... I find it's difficult to catch your idea here.... Do you mean equal opportunities for students? .... I feel you should rephrase this sentence.
Ways to better promote diversity among young students of different ethnicitiesethnicity is by teachers encouraging them to sit together , to partner them up with one another , and to assign them with joint projects so they can work with one another
Had you not lengthen this sentence it would have read much much better. You have good ideas, but you need to present them with better clarity. I also suggest you to employ direct speech to enhance clarity of your sentences;
Teachers can promote students to appreciate diversity through simple actions. Teachers can do this by having students of different ethnicity to sit together or making them be partners in interactive study groups.