Should I cite the primary sources if I have come across them in a secondary source?

When I read through an introduction of an original article by author S(2001), I found it a good source for my literature search. For instance, I came across the following paragraph: “Research has typically addressed modelling and imagery as separate and distinct process. However, several investigators have noted that modeling and imagery are actually quite similar (Druckman & Swets, 1988; Feltz & Landers, 1983; Housner, 1984; Mccullagh & Weiss, 2001; Ryan & Simons, 1983; Vogt, 1995). Both of these processes include the use of cognitive representations.” I would like to use this idea in my manuscript in this way: “Cognitive process of motor imagery is similar to the that of modeling(reference source will be mentioning here in this bracket)” and then I would like to reveal the reference source to support where the idea is from. However, I thought it’s okay to cite the source from the author S(2001) only but I got to know he actually also cited multiple sources from other sources. Here are my questions: I would like to know whether it’s okay to cite only the source from author S or whether I have to mention other sources that the author S had cited in his manuscript all together. To sum up my options: 1) Cite only author S as my source. This will definitely reduce my time spent on writing my paper. But the concern is: What if the idea was cited from other authors who thought about it in the first place? This is very confusing for me. 2) Cite both S and all the sources S has used– it seems the most ideal case. But when I consider the whole writing process it will take too long to complete it if I should find all of references of the author S have cited and review all of them. 3) Cite both S and the original sources, but mentioning only some of the references. But here is another concern - I cited the source from author S but author S also cited that from author A, but the author A also cited from author B. What am I supposed to do then? I would appreciate if you can provide me a clear answer that would end my confusion.