Original sentence: In September 1999, Nintendo published Sound Picture Box Mewtwo, which included the CD drama Myutsuu No Tanjou: Pocket-Monster Radio Drama (Birth of Mewtwo: Pokémon Radio Drama).The five-episode series details events prior to the the film and expand upon Mewtwo's origin for the anime series
Edited sentence: In September 1999, Nintendo published Sound Picture Box Mewtwo, which included Myutsuu No Tanjou: Pocket-Monster Radio Drama (Birth of Mewtwo: Pokémon Radio Drama), a CD drama that expands upon Mewtwo's origin for the anime series