彼にそんな波乱に満ちた過去があったなんての英語

He has a checkered past.

He is always dwelling on the pleasures of the past.

His past is wrapped in mystery.

He has a murky past.

He regrets the past

He meditated on his past life of suffering.

he spoke apologetically about his past

He has seen better days.

He's had fickle traits since before.

I have known him do some foolish things

He has, in common parlance, “seen better days.”

his place in history was foreordained

He is now in reduced circumstances, but he has seen better days.

he clung to the past determinedly

he tried to pick up the strands of his former life

He is now in reduced circumstances, but he has seen better days.

All his difficulties are now behind him.

He reviewed his past life.

Though he now follows a menial occupation, he has seen better days.

He has seen better days.

He has led a retired life so long that he is out of touch with the world.

He has seen better days.

He talked about the past.

Although he now pursues a menial occupation, he has seen better days.

He has become very industrious―very steady―of late.

I used to see a lot of him [was with him a great deal] before the war.

He has blighted your life.

His has long lived a retired life, and is out of touch with the world

He seems to have been happy.

He has lived in retirement so long that he must be out of touch with the times.