YOU SAID:

It has been a year since the older brother had succumbed to an unknown heart condition.

INTO JAPANESE

兄が未知の心臓病に屈してから1年が経ちました。

BACK INTO ENGLISH

A year has passed since my older brother succumbed to an unknown heart disease.

INTO JAPANESE

兄が未知の心臓病で亡くなってから1年が経ちました。

BACK INTO ENGLISH

One year has passed since my brother died of an unknown heart disease.

INTO JAPANESE

兄が未知の心臓病で亡くなってから1年が経ちました。

BACK INTO ENGLISH

One year has passed since my brother died of an unknown heart disease.