Complex sentence: The first film, "Fifty Shades of Grey", was released on February 13,2015, while the second, "Fifty Shades Darker", was released on February 10,2017.
Split into simpler sentences: The first film, "Fifty Shades of Grey", was released on February 13,2015. The second film, "Fifty Shades Darker", will be released on February 10,2017.