Simplify the following text for a Grade 10 native English-speaking person.
Original: Digimon is a Japanese anime television series .
Simplified: On March 6 , 1999 , the franchise was given an anime as the first of the Digimon movies aired in theaters in Japan . Originally , the Digimon Adventure movie was supposed to be a short film , but after the storyboard was finished , a request for Digimon becoming a children 's television show was made .