Complex sentence: The film is set to be released sometime in 2014; a trailer has been released, showing Ashleigh Ball detailing what happens in the film, showing highlights from BronyCon, and introducing bronies featured in the film.
Split into simpler sentences: The film is set to be released sometime in 2014. A trailer has been released; it presents Ashleigh Ball detailing the contents of the film and highlights from BronyCon, as well as introduces bronies featured in the film.