Parts of speech analysis

"The shocked daughter asks why he did this, to which Karnad says -- in the voice of a fine actor ambushed by a paycheque -- that someone has to stand up."
I read the above at Rediff.com
Please check if I have got the right parts of speech analysis:

"The shocked daughter"-subject , "why he did this "- a noun phrase acting as an object, " asks"- main verb.
" to which" -? Do not know the grammatical function,
"Karnard" - subject, "says"-verb
"In the voice of a fine actor"- ? And what is the grammatical function of the whole clause?
"Ambushed by a physique "- past participle

"That someone has to stand up" - noun clause acting as an object to " says"
What is "that" here?
I am learning to write longer sentences.
Thanks
Jignesh