Complex sentence: This book, second in the Harry Potter series became a film in which Dobby was a digital character, this method is expected to be reused when Dobby and Winky appear in the up and coming fourth movie.
Split into simpler sentences: This book, second in the Harry Potter series, became a film in which Dobby was a digital character. This method is expected to be reused when Dobby and Winky appear in the up and coming fourth movie.