Though I do not have the book American Corrections, I did find the conditions that inmates in Connecticut must agree to if they are to be released on parole. The conditions can be found at this link. I believe that it would not be easy to live up to all of these conditions. I would expect that somewhere around half of people released on parole would end up violating the conditions.
Many of the conditions that parolees in Connecticut must live up to would not be all that hard. They have to tell their parole officers where they are living. They cannot leave the state without permission from their parole officer. They have to inform their parole officer if their marital status changes. None of these conditions is particularly onerous.
However, there are conditions that would be hard to live up to. These conditions would be particularly difficult for parolees from certain social backgrounds. For example, parolees are not allowed to associate with any gangs or any gang members. This will be hard for parolees who come from areas where gangs are pervasive. As another example, parolees are required to participate in drug treatment if it is deemed necessary. If the parolees must pay for this treatment, it might be very difficult for them to manage. Parolees are required to live somewhere that will be approved by their parole officer. This could be very difficult if the parolee has no real family and no way to get enough money to live in an acceptable place. Finally, parolees are required to get jobs (or do community service) and to avoid breaking the law. This can be difficult for parolees who have little in the way of skills and are further hampered by their criminal records when they try to get jobs. Even if they do community service, they will have to get money to live from somewhere. This may lead them back into crime.
Thus, it will not be easy for everyone to live up to these conditions. I would guess that about half of paroled inmates will violate their parole conditions.