Петя узнал об этом до дня концерта,

Петя узнал об этом до дня концерта, но не сообщил своему приятелю Коле, так как у него был испорчен телефон.

Результаты (английский) 1:

Peter found out about it until the day of the concert, but did not tell his friend Cole because he has been spoiled by telephone.

Результаты (английский) 2:

Peter learned about it until the day of the concert, but did not tell his friend Cole, as he had been spoiled by the phone.

Результаты (английский) 3:

Petya learned about this before the concert, but it was not reported to my friend about Kole, because it has been corrupted phone.