How to paraphrase a paraphrased part? Lets assume that A wrote an article in 1999 and A included a part taken from B's source written in 1998. How do I paraphrase that part, and how do I cite it?

Like this; Blablablablabla blabla (A, 1999).
Or like this; Blablablabla blabla (B, 1998).
Or something different?
Why not include both? 

Blablabla  (A, 1999, and B, 1998).