Complex sentence: Ammonium nitrite, NH 4 NO 2, is formed by oxidizing ammonia with ozone or hydrogen peroxide; using precipitations from reacting barium or lead nitrites with ammonium sulfate, or silver nitrite with ammonium chloride.
Split into simpler sentences: Ammonium nitrite, NH 4 NO 2, is a salt which contains ammonium and nitrite ions. It can be formed by oxidizing ammonia with ozone or hydrogen peroxide, or in a precipitation reaction of barium or lead nitrite with ammonium sulfate, or silver nitrite with ammonium chloride.