The explanation is successful when the listener can take the next step alone.

An explanation is not finished when you have said it well. It is finished when the other person can do the thing without you standing there, which is a much higher bar and a different test. Plenty of elegant explanations leave the listener nodding and still unable to start, because clarity to the speaker and usability to the listener are not the same property.

Instead of asking whether that made sense, ask them to say the next step in their own words. Better still, let them do it while you sit on your hands. Where they stall is where your explanation stopped, and that is the part worth repeating.