1.Their car was caught in a traffic jam,_causing___the delay.
Their car was caught in a traffic jam,_which____ __caused__the delay.
2._Because___ _of___the traffic jam_in___ __which__I was caught ,I was late for the meeting.
_As__ __a__ result___ __of__ the traffic jam_in___ __which___I was caught ,I was late for the meeting.