Complex sentence: The movie is most likely based on the story of Stella and Ted as seen in the series, between Season 3 Episode 13 and Season 4 Episode 23, the episode, however, is based on a lot more than the movie.
Split into simpler sentences: The movie is most likely based on the story of Stella and Ted as seen in the series, between Season 3 Episode 13 and Season 4 Episode 23. The episode, however, is based on a lot more than the movie.