CSV to sentence

Questions & Suggestions
1

The attached macro is part of a larger macro that outputs text in CSV format. Is it possible to convert the text from CSV to sentence.

Therefore, instead of this being copied to clipboard:

Bay-breasted Warbler,Blackpoll Warbler,Black-throated Blue Warbler

This should be copied to clipboard (space after comma, and, full stop):

Bay-breasted Warbler, Blackpoll Warbler and Black-throated Blue Warbler.

sentence.kmmacros (1.5 KB)

Keyboard Maestro Export
Keyboard Maestro Export2086×1036 158 KB

2

Putting aside preference for or against Oxford commas, my personal habit is to write this kind of thing:

Sentence from CSV.kmmacros (3.5 KB)

Keyboard Maestro Export
Keyboard Maestro Export1260×1468 194 KB

Expand disclosure triangle to view JS source 
const
    xs = (kmvar.local_CSV || "").split(","),
    n = xs.length;

return 1 < n
    ? `${xs.slice(0, -1).join(", ")} and ${xs[n - 1]}.`
    : kmvar.local_CSV;

but you should also be able to do it with Keyboard Maestro variable arrays:

manual:Variable Arrays [Keyboard Maestro Wiki]