Complex sentence: In the late 1940s Amazing presented as fact stories about the Shaver Mystery, a lurid mythos that explained accidents and disaster as the work of robots named deros, which led to dramatically increased circulation but also widespread ridicule.
Split into simpler sentences: In the late 1940s "Amazing" began to print stories about the Shaver Mystery, a lurid mythos that explained accidents and disaster as the work of robots named "deros". The stories were presented as fact, and led to dramatically increased circulation but also widespread ridicule.