The terrorist attack that took place while I was living in N.Y was a dreadful experience for me.
The terrorism that happened during my stay in N.Y was a very frightening experience.
どちらも「NY滞在中にテロにあって怖い思いをしました。」という言い方です。
1) The terrorist attack that took place while I was living in N.Y was a dreadful experience for me.
2) The terrorism that happened during my stay in N.Y was a very frightening experience.
「N.Y滞在中」は
while I was living in N.Y.
during my stay in N.Y.
と言えます。
「怖い思いをした」は
XX was a dreadful experience.
XX was a frightening experience.
と言えます。
ご参考になれば幸いです！
There was a terrorist incident while I was in New York. It was terrifying.
I was in New York when there was a coordinated terror attack. I was so scared.
1) There was a terrorist incident while I was in New York. It was terrifying.
NY滞在中にテロ事件がありました。すごく怖かったです。
テロ事件 は terrorist incident, terror attack などと言います。
怖かった は、色々な表現があり、It was terrifying, It was very scary, I was so scared, I was terrified, I was really shook (カジュアル) などと言えます。
2) I was in New York when there was a coordinated terror attack. I was so scared.
同時多発テロがあった時、ニューヨークにいました。すごく怖かったです。
同時多発テロ は coordinated terror attack です。
During my stay in New York, I was involved in a terrorist attack. It was a traumatizing experience.
During my stay in New York, I was involved in a terrorist attack. I was scared to death.
❶During my stay in New York, I was involved in a terrorist attack. It was a traumatizing experience.
(ny滞在中にテロにあった。とてもトラウマだった)。
❷During my stay in New York, I was involved in a terrorist attack. I was scared to death.
(ny滞在中にテロにあった。死ぬほど怖かった)。
と言えます。参考に。
日本 
アイルランド 
アメリカ合衆国 
