Hi
@DTB! Is this an application question? If so, what's the word count?
If it's an interview question you're practising for, I'd recommend a structure where you briefly state where your work ex was, how long it was for and the position you held

describe your role and responsibilities

elaborate on any major projects you undertook, efficiencies you brought in or achievements you had during your time.
I don't think you need to mention challenges but would definitely have an answer ready for challenges you faced, why you left etc. in case you're asked follow-up questions!