Verses 1-2 give background information telling us what Saul has been doing since the stoning of Stephen. Here the word "him" refers to the high priest and "he" refers to Saul. (See: [[rc://en/ta/man/jit/writing-background]])
This refers to the people in the synagogues. Alternate translation: "for the people in the synagogues" or "for the leaders in the synagogues" (See: [[rc://en/ta/man/jit/figs-metonymy]])
"he might take them as prisoners to Jerusalem." Paul's purpose can be made clear by adding "so that the Jewish leaders could judge and punish them" (See: [[rc://en/ta/man/jit/figs-explicit]])