Complex sentence: Nestle and other companies declined an invitation to watch the film and to answer questions, so Mistrati set up a large screen next to Nestle's headquarters in Switzerland, forcing employees to catch a glimpse of the truth of child labor in the cocoa industry.
Split into simpler sentences: Nestle and other companies declined an invitation to watch the film and to answer questions. In response, Mistrati set up a large screen next to Nestle's headquarters in Switzerland, forcing employees to catch a glimpse of child labor in the cocoa industry.