Using a comma in a list of two when the first item is very long

Solution 1:

Commas can be used to introduce a pause to a sentence. There are multiple reasons why a comma can be introduced where it wouldn't necessarily be required:

• verbal effect: so the speaker can catch his breath.
• to illustrate that a pause was taken by the speaker (e.g. in a story or transcript). This is a matter of accurately portraying the speaker's speech pattern, in cases where it is relevant.
• for the purpose of readability: so the reader can clearly separate parts of a complex sentence.

The third option fits for your case.

Even if a comma does not make sense from a grammatical perspective, it is allowed to exist, as long as it does not unnecessarily obstruct the reader's understanding.