Explaining a gap after caregiving or layoff after 12 years as an IT help-desk technician

My résumé shows a gap from a layoff and some health issues. I have read a lot of threads here and could not find my exact situation. I have done some volunteering and a course during that time. How did you handle it on your résumé?

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