Is any way to turn the gaps into strengths as part of your narrative in the statement of purpose? If so, that is likely better than separating them in an appendix. For example, if you spent time in industry, did it give you a better appreciation of why you wanted to return to studies? If you took time off for personal or family reasons, did it give you time to reflect or experiences that have shaped why you want to return to graduate school? More mature students who are in a graduate program because they really understand what they want out of it are often highly appreciated by professors. If that is you, then embrace the gaps in your transcript and let them be (a small) part of your main narrative.

Is there any way to turn the gaps into strengths as part of your narrative in the statement of purpose? If so, that is likely better than separating them in an appendix. For example, if you spent time in industry, did it give you a better appreciation of why you wanted to return to studies? If you took time off for personal or family reasons, did it give you time to reflect or experiences that have shaped why you want to return to graduate school? More mature students who are in a graduate program because they really understand what they want out of it are often highly appreciated by professors. If that is you, then embrace the gaps in your transcript and let them be (a small) part of your main narrative.