Complex sentence: Papp was notoriously paranoid, keeping his workshop under lock and key and covering every component in plaster to stop people from taking photographs and resulting in the media claiming that his submarine was made of paper mache.
Split into simpler sentences: Papp was notoriously paranoid, keeping his workshop under lock and key and covering every component in plaster to stop people from taking photographs. As a result the media claimed that his submarine was made of paper mache.