comma before and after 'since' [conjunction]: evidence, since, as we

[Sextus]

"The internal evidence about Sextus’ profession is confirmed by the external evidence since, as we will see in the next section, we also know from Diogenes Laertius and a pseudo-Galenic work that Sextus was a physician."

Should I put a comma before "since" or would that be too much?

 

[Floridian]

You do not use a comma to separate a clause introduced by since from the main clause.

There must be a list somewhere. The conjunctions that require a comma before them include 'and', 'but', 'or'. Somebody should be able to provide a link to a grammar with these rules.

 

[Floridian]

Actually I just remembered the mnemonic for this rule.

FANBOYS

for, and, nor, but, or, yet, so

These are the conjunctions that require a comma before them.

 

[bibliolept]

Except for very short clauses following because, the comma would be used. Here, I can see why you might be reluctant to add it. I would add it, but you shouldn't feel compelled to do so based on readability alone.