As political corruption scandals unfold one after another, they've found out that the guy, once highly regarded, has also bribed some politicians.
こんにちは!
ご質問ありがとうございます。
ご質問について、いくつか言い方が考えられますが、例えば、
As political corruption scandals unfold one after another, they've found out that the guy, once highly regarded, has also bribed some politicians.
とすると、『政治家の汚職事件が次々に[発覚](https://eikaiwa.dmm.com/uknow/questions/96927/)する中、高い信頼を得ていたその男も数人の政治家に賄賂を贈っていた』となります。
参考になれば幸いです。