Complex sentence: Subjective Expected Utility Theory (SEU) has been widely disregarded since its addition to the fear appeal models, it being an entirely cognitive process which neglects any role of fear in the process of persuasion.
Split into simpler sentences: Subjective Expected Utility Theory (SEU) has been widely disregarded since its addition to the fear appeal models. SEU is often neglected because it is described as entirely cognitive process which neglects any role of fear in the process of persuasion.