It is possible to see how a horse has done after a layoff, but it isn't easy. You can go to Equibase and look up the specific horse. All the life time starts are listed there by date. You then have to go through and find the long gaps, say 90 days or more, and see how the horse did on the 1st and 2nd races after coming back.
Problems are that with a younger horse, you may not find any meaningful data, and an older horse may have changed trainers a number of times over the years. And I would argue that the trainer's record with returning horses is as important as the horse's history.
At random, I looked up an older horse that is running in the 4th at Monmouth tomorrow:
Taperrific. Click on the "Results" tab under the horse's name to see the full lists of starts.