Simplify the following text for a Grade 12 native English-speaking person.
Original: The selenium dioxide is dissolved in acidic water to make selenous acid , which is reacted with sulfur dioxide to make selenium as an element .
Simplified: The selenium dioxide is then mixed with water and the solution is acidified to form selenous acid ( oxidation step ) . Selenous acid is bubbled with sulfur dioxide ( reduction step ) to give elemental selenium .