Hi Becky,
The company wants sales I presume? Content=traffic=sales. As you correctly mention you should add more content. You can also do this with a small introduction text and than a Read More which unfolds when clicked on. A different way is to put a small introduction at the top and the whole story down the page. This way you are not hiding the text and it does help you rank better.
There's a good Q&A about it here on: Moz
Furthermore I would indeed go for extra pages. In my industry ( Garden And Wood building materials) it works really well to write "how to" pages. You get good traffic, they stay on your site for a long time and it influences the overall ranking in a good way.
Hope it helps, Good luck!
Tymen