Complex sentence: A major premise of the novel is that Professor Johnston left a message along with his eye glasses in the past, which were then discovered by the dig team; another instance of controversy is the discovery of Marek's tomb at the end of the novel.
Split into simpler sentences: A major premise of the novel is that Professor Johnston left a message along with his eye glasses in the past, which were then discovered by the dig team. Another instance of controversy is the discovery of Marek's tomb at the end of the novel.