Мы очень волновались за свою дочь, когда она отправилась в экспедицию. Мы ничего не слышали о ней, пока не увидели телевизионную программу об этой экспедиции.
We were very worried for her daughter when she went on an expedition. We never heard about it until I saw a television programme about this expedition.
We are very worried about her daughter when she went to the expedition. We have not heard anything about it until I saw a television program about the expedition.
We were worried for his daughter, when she went for an expedition. We have not heard much about it, until we saw a television program on this expedition.