How do I handle a long gap on my résumé? (update)

My résumé shows a gap from a layoff and some health issues. It has been weighing on me all week. I am not sure how much to explain. What do you say in interviews?

I was hired after a 11-month gap. The manager said the skills test mattered more than the dates.

I listed the volunteering and course under the same dates and kept the explanation to a sentence in the cover letter.