Complex sentence: At SHIN-EI ANIMATION, he began his work with a TV series "Kaibutsu-kun" as a production manager, then was moved to another project "Doraemon", for which he was for the first time in charge of an animation director.
Split into simpler sentences: At SHIN-EI he began working on a TV series "Kaibutsu-kun" as a production manager, then was moved to "Doraemon". Here he was for the first time in charge of an animation director.