Complex sentence: A tweet by Osborne revealed that the show's final script was pitched to storyboarders Sam Alden and Hanna K. Nyström on November 28, and Alden later announced that the storyboard was pitched to the show's producers during the third week of December 2016.
Split into simpler sentences: A tweet by Osborne revealed that the show's final script was pitched to storyboarders Sam Alden and Hanna K. Nyström on November 28. This final storyboard was pitched to the show's producers during the third week of December 2016.