Complex sentence: Within this framework, individuals learn to attune to and pursue reward or escape from a stressor; individuals differ in how quickly and for how long they display preferences for pursuing reward or in the case of distress tolerance, escaping from a distressful stimulus.
Split into simpler sentences: Within this framework, individuals learn to attune to and pursue reward; reduction of tension in escaping from a stressor is similarly framed as a reward and thus can be learned. Individuals differ in how quickly and for how long they display preferences for pursuing reward or in the case of distress tolerance, escaping from a distressful stimulus.