OET interlinear HERO (JDG) 21:15

uW Translation Notes:

Note 1 topic: grammar-connect-logic-result

וְ⁠הָ⁠עָ֥ם נִחָ֖ם לְ⁠בִנְיָמִ֑ן כִּֽי־עָשָׂ֧ה יְהוָ֛ה פֶּ֖רֶץ בְּ⁠שִׁבְטֵ֥י יִשְׂרָאֵֽל

and,the,people had_compassion to,Benjamin (Some words not found in UHB: and,the,people had_compassion to,Benjamin that/for/because/then/when he/it_had_made YHWH breach in,the_tribes_of Yisrael )

If it would be more natural in your language, you could reverse the order of these phrases, since the second phrase gives the reason for the result that the first phrase describes. Alternate translation: [And because Yahweh had made a breach in the tribes of Israel, the people repented itself for Benjamin]

Note 2 topic: figures-of-speech / metaphor

כִּֽי־עָשָׂ֧ה יְהוָ֛ה פֶּ֖רֶץ בְּ⁠שִׁבְטֵ֥י יִשְׂרָאֵֽל

(Some words not found in UHB: and,the,people had_compassion to,Benjamin that/for/because/then/when he/it_had_made YHWH breach in,the_tribes_of Yisrael )

The author is speaking as if the tribes of Israel were a wall and Yahweh had made a breach or hole in it by removing the tribe of Benjamin. If it would be clearer in your language, you could state the meaning plainly. Alternate translation: [for Yahweh had removed one of the tribes from Israel]