In my last writing exam I wrote:
... when I decided to address the matter to the headwaiter, he rudely recommended delivering any sort of complaint by writing. Offering no prompt solution to the situation.
My teacher pointed out that the second sentence starting with a gerund as wrong. She said that it was an unfinished idea with no proper connection to the rest of the text. But I don’t get what she meant; to me, it sounds okay. However, I am thinking in my native language and I'm overlapping rules, structures and such.
Could someone explain this to me?