Question:
The couple who saw her off were probably her parents. (Make it Simple)
My answer:
The couple seeing her off were probably her parents.
My teacher said that my answer is wrong, and the proper answer should be:
The couple, probably her parents, saw her off.
When I asked why my answer is wrong, he said that the word "seeing" isn't used in these cases and whenever there is a single subject, to make it a simple sentence "ing" is used in the start of the sentence.
I understand that I have used "seeing" as the 3rd word in the sentence, rather than at first; but I don't understand why is that an issue?