Ambiguous re-write?

a) Every counter-factual if clause, both the second and third conditional, requires the subjunctive.

Here is a re-write, to prevent a pause between S and V:

b) Every counter-factual 'if clause' requires the subjunctive, both the second and third conditional.

1) Is 'both the second and third conditional' a correlative conjunction, and is the phrase itself modifying (adjectivally) the subject 'every counter-factual if clause'?

2) If this is true, then is the phrase in bold in sentence b too far away from the word it modifies; that is, is it ambiguous?

Thanks!