Complex sentence: She first appeared, cast as a magical girl, on the merchandise CD "Triangle Heart 3 ~ Lyrical Toy Box ~" released on June 29,2001 and that was written by Masaki Tsuzuki, the creator of the "Magical Girl Lyrical Nanoha" franchise.
Split into simpler sentences: She first appeared, cast as a magical girl, on the merchandise CD "Triangle Heart 3 ~ Lyrical Toy Box ~" released on June 29,2001. I was written by Masaki Tsuzuki, the creator of the "Magical Girl Lyrical Nanoha" franchise.