大学英语~After a while ,like a dawn's brightening,a further answ

大学英语~
After a while ,like a dawn's brightening,a further answer did come--that there were people to thank,people who had done so much for me that I could never possibly repay them.
there were people to thank,people who had done so much for me that I could never possibly repay them.逗号后面怎么还加个先行词阿?