Simplify the following text for a Grade 14 native English-speaking person.
Original: Alternatively , it can be obtained by dissolving cadmium or cadmium oxide in hydrobromic acid and evaporating the solution to dryness under helium in an inert atmosphere .
Simplified: Cadmium bromide is made by reacting cadmium with bromine or by reacting cadmium or its oxide with hydrobromic acid and evaporating the solution in helium .