Complex sentence: It has been shown preferences dictate an individual's mate value leading to the prioritising of certain characteristics by some and not others, therefore resulting in potential mates to have various mate values dependent on the mate-seekers's preferences.
Split into simpler sentences: It has been shown preferences dictate an individual's mate value, leading to the prioritising of certain characteristics by some and not others. This results in potential mates having various mate values dependent on the mate-seekers's preferences.