OET interlinear 1 SAM 4:18

uW Translation Notes:

Note 1 topic: writing-pronouns

כְּ⁠הַזְכִּיר֣⁠וֹ ׀ אֶת־אֲר֣וֹן הָ⁠אֱלֹהִ֗ים וַ⁠יִּפֹּ֣ל & אֲחֹ֨רַנִּ֜ית

(Some words not found in UHB: and=he/it_was just,as,he_brought_to_remembrance DOM ark_of the=ʼElohīm and,he_fell from=under the=seat backward behind side_of of,the_gate and,it_was_broken neck_of,his and=he/it_died that/for/because/then/when old the=man and,heavy and=he judged DOM Yisrael forty year )

The pronoun his refers to the messenger, while the pronoun he refers to Eli. It may be helpful to clarify this for your readers. Alternate translation: [when the messenger mentioned the Box of God, that Eli fell backward]

Note 2 topic: grammar-connect-logic-result

וַ⁠תִּשָּׁבֵ֤ר מַפְרַקְתּ⁠וֹ֙ וַ⁠יָּמֹ֔ת כִּֽי־זָקֵ֥ן הָ⁠אִ֖ישׁ וְ⁠כָבֵ֑ד

(Some words not found in UHB: and=he/it_was just,as,he_brought_to_remembrance DOM ark_of the=ʼElohīm and,he_fell from=under the=seat backward behind side_of of,the_gate and,it_was_broken neck_of,his and=he/it_died that/for/because/then/when old the=man and,heavy and=he judged DOM Yisrael forty year )

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 since the man was old and heavy, his neck was broken, and he died]

Note 3 topic: figures-of-speech / activepassive

וַ⁠תִּשָּׁבֵ֤ר מַפְרַקְתּ⁠וֹ֙

(Some words not found in UHB: and=he/it_was just,as,he_brought_to_remembrance DOM ark_of the=ʼElohīm and,he_fell from=under the=seat backward behind side_of of,the_gate and,it_was_broken neck_of,his and=he/it_died that/for/because/then/when old the=man and,heavy and=he judged DOM Yisrael forty year )

If your language does not use this passive form, you could express the idea in active form or in another way that is natural in your language. Alternate translation: [And he broke his neck]

Note 4 topic: writing-endofstory

וְ⁠ה֛וּא שָׁפַ֥ט אֶת־יִשְׂרָאֵ֖ל אַרְבָּעִ֥ים שָׁנָֽה

and=he (Some words not found in UHB: and=he/it_was just,as,he_brought_to_remembrance DOM ark_of the=ʼElohīm and,he_fell from=under the=seat backward behind side_of of,the_gate and,it_was_broken neck_of,his and=he/it_died that/for/because/then/when old the=man and,heavy and=he judged DOM Yisrael forty year )

Here the author is presenting information that concludes the story of the life of Eli. This is the last mention of Eli in the book. Your language may have its own way of presenting such information.