It is vitally important to keep abreast of business and job developments during a career break.
Discussions with your employer need to take place to determine how you might achieve keeping in touch.
You might, for example, agree that any organisational house journals are forwarded to you.
A career break for training and development purposes might involve holiday periods away from study. These periods could be spent back at work.
Performance review meetings could be arranged periodically during your career break.
If your organisation has a website and you have internet access this might be a mechanism by which you could keep in touch with developments at work.