NET
25 So Barnabas and Saul returned to Jerusalem when they had completed their mission, bringing along with them John Mark.
Darby
25 And Barnabas and Saul returned from Jerusalem, having fulfilled the service [entrusted to them], taking also with them John, surnamed Mark.
KJV
25 And Barnabas and Saul returned from Jerusalem, when they had fulfilled [their] ministry, and took with them John, whose surname was Mark.