Extract Data From Large Spreadsheet?

I have a very large spreadsheet that was exported from an ecommerce site with close to 1000 products. I have one column that I need to extract some text from. This column holds all of the html from the product description and is huge. I only need to extract the actual description of the product, but am having a very hard time figuring out how to do it. I've tried using the mid, left, and right function; but not all of the html is the same so it's not really working the way I need it to.

I have multiple tags throughout the html that I can use with the mid function, but there is more than one occurrence of them. So, how can I tell it to start at the 4th occurrence? I've spent countless hours searching, but I'm a complete novice when it comes to excel and I don't even know what to search for. I end up looking through sites that explain how to pull the Y out of XYZ, which is what I need, just on a much larger (and more complicated) scale.

It was suggested that I set up a macro that will find the 4th occurrence of the word, and then uses the mid function to pull the data out, but when I try to find the word, it says it doesn't exist even though I can see it right in front of me.