OET interlinear 2 KI 23:12

uW Translation Notes:

Note 1 topic: figures-of-speech / explicit

אֲשֶׁ֣ר עַל־הַ⁠גָּג֩ עֲלִיַּ֨ת אָחָ֜ז

(Some words not found in UHB: and,DOM the,altars which/who on/upon/above/on_account_of//he/it_went_in the,roof upper_chamber_of ʼĀḩāz which/who they_had_acquired kings_of Yehuda and=DOM the,altars which/who he/it_had_made Mənashsheh in,the_two_of courts_of house_of YHWH pulled_down the=king and,he_ran from=there and,he_threw DOM dust_of,their to/towards wadi_of Qidrōn )

This could mean: (1) that these altars were on the roof of an upper chamber that Ahaz had built somewhere in the palace complex. Alternate translation: [that were on the roof of the upper chamber of Ahaz] or (2) that these altars were on the roof of the palace, near an upper chamber that Ahaz had built. Alternate translation: [that were on the palace roof near the upper chamber of Ahaz]

Note 2 topic: figures-of-speech / hendiadys

וַ⁠יָּ֣רָץ מִ⁠שָּׁ֔ם וְ⁠הִשְׁלִ֥יךְ אֶת־עֲפָרָ֖⁠ם אֶל־נַ֥חַל קִדְרֽוֹן

(Some words not found in UHB: and,DOM the,altars which/who on/upon/above/on_account_of//he/it_went_in the,roof upper_chamber_of ʼĀḩāz which/who they_had_acquired kings_of Yehuda and=DOM the,altars which/who he/it_had_made Mənashsheh in,the_two_of courts_of house_of YHWH pulled_down the=king and,he_ran from=there and,he_threw DOM dust_of,their to/towards wadi_of Qidrōn )

The verbs ran and threw together express a single idea. The word ran tells in what way Josiah removed the dust and threw it into the Kidron Valley (or had his servants do this). If it would be more natural in your language, you could express this meaning in a different way. Alternate translation: [And he hastened to have their dust thrown into the Valley of Kidron]