Complex sentence: Such a creator may or may not be existing in physical surroundings such as darkness or water, but does not create the world from them, whereas in creation from chaos the substance used for creation is pre-existing within the unformed void.
Split into simpler sentences: Such a creator may or may not be existing in physical surroundings such as darkness or water, but does not create the world from them. In creation from chaos the substance used for creation is pre-existing within the unformed void.