The word "he" refers to Jesus Christ. You can translate this in an active form. AT: "God declared him to be the Son of God" (See: [[rc://en/ta/man/translate/figs-activepassive]])
God has given Paul the gift of being an apostle. You can translate this in an active form. AT: "God caused me to be an apostle. This is a special privilege" (See: [[rc://en/ta/man/translate/figs-activepassive]])
Here the word "we" refers to Paul and to the apostles that followed Jesus but excludes the believers in the church in Rome. (See: [[rc://en/ta/man/translate/figs-exclusive]])
Paul uses the word "name" as a metonym to refer to Jesus. AT: "in order to teach all nations to obey because of their faith in him" (See: [[rc://en/ta/man/translate/figs-metonymy]])