YOU SAID:

once there was a person who bladder exploded

INTO JAPANESE

膀胱が爆発した人がいたら

BACK INTO ENGLISH

If there was a person whose bladder had exploded

INTO JAPANESE

膀胱が爆発した人がいた場合

BACK INTO ENGLISH

When there was a person whose bladder had exploded

INTO JAPANESE

膀胱が爆発した人がいたとき

BACK INTO ENGLISH

When there was a person whose bladder had exploded