"He was a nuclear specialist at the Science and Technology Agency and was once the Director General of the Nuclear Safety Bureau."
"He was a nuclear specialist at the Science and Technology Agency and was once the Director General of the Nuclear Safety Bureau."
"He" 「彼は」Tさんのことを表します。
"he was ~" 「〜でした」
"a nuclear specialist" 「原子力専門」
"at ~" 「〜で」
"the Science andTechnology Agency" 「科学技術庁」
"and was once ~" [「かつては〜」](https://eikaiwa.dmm.com/uknow/questions/54094/)
"the Director General of the Nuclear Safety Bureau." 「原子力安全局長」
オーストラリア 
