Complex sentence: The original concept for the show was developed by Takehiko Ito, much of the story was written by Satoru Akahori, and the mecha design was done by Rei Nakahara.
Split into simpler sentences: The original concept for the show was developed by Takehiko Ito. Much of the story was written by Satoru Akahori, and the mecha design was done by Rei Nakahara.