英语翻译他声称自己曾经是战争犯.众所周知,前任校长（headmaster）已退休了.尽管已尽了一切努力去做生意,但Phelps还是失败了.提示:claim to do...(声称) ,it is known that...(众所周知) ,retire from(退出) ,make every effort（尽了一切努力）

He claimed himself to be a war criminal.
It's known to all that the ex-headmaster has retired from his position.
Despite that he made every effort he could to do business, Phelps failed at last.

He claimed that he was once a war criminal
as we all know, the former President (headmaster) has retired although has done my all efforts to do business, but Phelps failed

He claims he used to be war criminals.
It is well known that former President retired.
Although all efforts are made to do business, but Phelps still failed.

He claimed himself to be a war criminal at one time .
It is well known that the former headmaster has already been retired from work .
Althrough he made every effort to do his business , Phelps ended up with failure .

他声称自己曾经是战争犯.
--- He claims to have been a war criminal.
众所周知,前任校长（headmaster）已退休了.
---It is known to all that the former headmaster has retired from his position.
尽管已尽了一切努力去做生意,但Phelps还是失败了.
--- Phelps ended up in failure though he had made every effort to do business.
提示:claim to do...(声称) ,it is known that...(众所周知) ,retire from(退出) ,make every effort（尽了一切努力）

He claimed that he had been a *er of war. As everyone knows, the former president has retired. Despite efforts to do business, but Phelps failed.
望采纳！！！