en_tn/rom/15/08.md

For I say

The word "I" refers to Paul.

Christ has been made a servant of the circumcision

Here "the circumcision" is a metonym that refers to the Jews. You can translate this in an active form. Alternate translation: "Jesus Christ has become a servant of the Jews" (See: rc://en/ta/man/jit/figs-metonymy and rc://en/ta/man/jit/figs-activepassive)

in order to confirm the promises

This is one of the two purposes for which Christ became a servant of the circumcision.

the promises given to the patriarchs

Here "the fathers" refers to the ancestors of the Jewish people. You can translate this in active form. Alternate translation: "the promises that God gave to the ancestors of the Jews" (See: rc://en/ta/man/jit/figs-explicit and rc://en/ta/man/jit/figs-activepassive)