1) I learned that my friend has lost consciousness due to a traffic accident injury.
2) I learned that my friend has lost consciousness in a traffic accident.
1) I learned that my friend has lost consciousness due to a traffic accident injury.
"友人が交通事故での怪我により意識不明になったことを知った"
I learned that : を知った
my friend has lost consciousness : 友人が意識不明にな
due to a traffic accident injury : 交通事故での怪我により
それとも簡単に：
2) I learned that my friend has lost consciousness in a traffic accident.
"友人が交通事故で意識不明になることを知りました"
モロッコ 
