Unto this day - These words are probably taken from the record which the writer of Chronicles had before him, and do not imply that the Simeonites remained undisturbed in their conquests until after the return from the captivity. So 1 Chronicles 4:41.
Related Commentaries of 1 Chronicles 4:43
1 Chronicles 4:43
43 And they smote the rest of the Amalekites that were escaped, and dwelt there unto this day.