Here is how I would put it, using a doctor example:
(1) If a 6 years old gets sick, he/she would be taken to the clinic to see a doctor. The doctor would check on him/her to identify what's wrong, and then give him/her meds to recover and get stronger
(2) Companies are like human, they can get sick too. So when companies fall sick, consultants are their doctors. Consultants help them do checkups to see what's wrong, and then give companies meds to help them fix the problem, recover, and grow stronger in the future
Hope it helps,
Emily