Complex sentence: Johnny begins to breathe hard as a great gust of wind shakes everything and undergoes a transformation from a normal boy into the hideous demon dubbed the "Fair-Haired Child" (Walter Phelan).
Split into simpler sentences: Johnny begins to breathe hard as a great gust of wind shakes everything. Johnny undergoes a transformation from a normal boy into the hideous demon dubbed the "Fair-Haired Child" (Walter Phelan).