Complex sentence: In July 2014, it was announced that a separate film project, a cartoon special based on the attraction animated by Gris Grimly, was being developed in honor of the 45th anniversary, to be aired on the Disney Channel and Disney XD.
Split into simpler sentences: In July 2014, it was announced that a separate film project, a cartoon special based on the attraction and animated by Gris Grimly, was being developed in honor of the 45th anniversary. It is to be aired on the Disney Channel and Disney XD.