Complex sentence: On October 2,2014, Pixar released an official teaser trailer for the film showing emotion in past Pixar films, and then leading the audience to wonder where all those emotions coming from, then introducing the lead characters of the story living inside Riley's head.
Split into simpler sentences: On October 2,2014, Pixar released an official teaser trailer for the film. The trailer begins by showing emotions in past Pixar films, and then leading the audience to wonder where all those emotions coming from, then introducing the lead characters of the story living inside Riley's head.