YOU SAID:

Twenty people went walking on ice when he farted and laughed

INTO JAPANESE

彼がおならして笑ったとき、20人が氷の上を歩いていました

BACK INTO ENGLISH

Twenty people were walking on the ice when he flatulent and laughed

INTO JAPANESE

彼が鼓腸して笑ったとき、20人が氷の上を歩いていました

BACK INTO ENGLISH

Twenty people were walking on the ice when he flattened and laughed

INTO JAPANESE

彼が平らになって笑ったとき、20人が氷の上を歩いていました

BACK INTO ENGLISH

Twenty people were walking on the ice when he flattened and laughed