Simplify the following text for a Grade 5 native English-speaking person.
Original: Disney Mickey 's Magix was a breakfast cereal made by Kellogg 's & Disney in the United States , described by the company as a `` naturally sweetened toasted oat cereal with marshmallows . ''
Simplified: Disney Mickey 's Magix was a breakfast cereal made by Kellogg 's and Disney .