Complex sentence: Cultural factors manifest themselves in an exaggerated emphasis on appearance, physical strength and attractiveness: for instance, people compare themselves with idealized cultural figures such as unattainably muscular heroes in children's books and action figures (e.g. G.I. Joe).
Split into simpler sentences: Cultural factors manifest themselves in an exaggerated emphasis on appearance, physical strength and attractiveness. For instance, people compare themselves with idealized cultural figures such as unattainably muscular heroes in children's books and action figures (e.g. G.I. Joe).