Complex sentence: Originally, the producers of the movie adaption of the book "Into Thin Air" were contacted to help them, who were shocked at their troubles, as they replied that they had simply made up translations in the movie.
Split into simpler sentences: Originally, the producers of the movie adaption of the book "Into Thin Air" were contacted to help. They were shocked at the trouble the staff was going to, as they replied that they had simply made up translations in the movie.