4 They risked their lives for me. Not only I but all the churches of the Gentiles are grateful to them.

Read Romans 16:4 Using Other Translations

Who have for my life laid down their own necks: unto whom not only I give thanks, but also all the churches of the Gentiles.
who risked their necks for my life, to whom not only I give thanks but all the churches of the Gentiles give thanks as well.
In fact, they once risked their lives for me. I am thankful to them, and so are all the Gentile churches.