Те из них, кто не сумел приспособит

Те из них, кто не сумел приспособиться к американской реальности, возвращались в свои страны.

Результаты (английский) 1:

Those who failed to adjust to the American reality, returning to their home countries.

Результаты (английский) 2:

Those who could not adjust to the American reality, back to their country.

Результаты (английский) 3:

Those of them who had not been able to adapt to the American reality, returned to their country.