NLP - Find which Verb is talking about the Noun in a sentence
That's a good suggestion, I will try it with anaphora too. 
For now, my problem is solved by the concept of noun phrase & verb phrase.   

I extracted clause(s) from the sentence
identified verbs & nouns in each, and
related them through an iterative technique.  

Thank you for the help.
Given a sentence, Using python NLTK how can I know which Verb is talking about which Noun.  
Eg: Cat sat on the mat.
Here "sat(verb)" is talking about "Cat(noun)".  
Consider a complex sentence which has more nouns & verbs
Thank You.