Jack was able to run out of the house. It collapsed, (before)
Jack was able to run out of the house before it collapsed.
The rescue workers heard a whistle. They quickly came to rescue the victims. (On)
On hearing a whistle, the rescue workers quickly came to rescue the victims.
The soldiers searched the area. They found all the missing people in the landslide.(until)
The soldiers searched the area until they found all the missing people in the landslide.
She gave us some tips. The tips were about identifying poisonous mushrooms.(about)
She gave us some tips about identifying poisonous mushrooms.
The flood receded. The villagers came back to their home. (After)
After the flood receded, the villagers came back to their homes.