Hi. Apparently long text fields are not supported in list views or formulas.

Error: You referenced an unsupported field type called "Long Text Area" using the following field: Description

I'm trying to develop a formula that will display the first sentence from a long text field.
I thought that I could use a FIND function to locate the first period, then return the text before that.
But, the long text field that I'm looking for is not shown as a field that I can insert. (I want to use Lead > Description) So, I just typed it in.

Some of my users have leads that are the same except for the description, and I'm trying to figure out a better way for distinguishing them from a list view. Otherwise they look like dupes. I don't want to add an extra custom text field that they have to enter.

Thoughts on how to resolve? Alternatives? Thanks in advance.