Sentence:  From the point of view of syntactic analysis the head word in the statement is the predicator has broken , and from the point of view of meaning it would seem that the trouble centers in the breaking ; but dominant stress will be assigned to broken only in rather exceptional versions of the <WSD>sentence</WSD> . 
Meaning of the word marked with <WSD> tags:  a string of words satisfying the grammatical rules of a language