19 Paul greeted them and reported in detail what God had done among the Gentiles through his ministry.

Read Acts 21:19 Using Other Translations

And when he had saluted them, he declared particularly what things God had wrought among the Gentiles by his ministry.
After greeting them, he related one by one the things that God had done among the Gentiles through his ministry.
After greeting them, Paul gave a detailed account of the things God had accomplished among the Gentiles through his ministry.