First find the paths where indirect recursion happens. Here indirect recursion A→Sd happening in this production.
Then put all the production of S in that variable.You get $\large A\rightarrow Ac| Aad | bd |\epsilon$
Then do the normal procedure as we remove direct left recursion.
$S\rightarrow Aa|b$
$A\rightarrow bdA' | A'$
$A'\rightarrow cA' | adA' | \epsilon$