Complex sentence: For Eakins, portraiture held little interest as a means of fashionable idealization or even simple verisimilitude--it provided the opportunity to reveal the character of an individual through the modeling of solid anatomical form.
Split into simpler sentences: For Eakins, portraiture held little interest as a means of fashionable idealization or even simple verisimilitude. Instead, it provided the opportunity to reveal the character of an individual through the modeling of solid anatomical form.