Samuel clemens became one of the best-loved american storytellers. sentence or sentence fragment

The statement is a sentence because there is a subject, a predicate, and the thought is complete.
The subject of the sentence is: Samuel Clemens
The predicate is: became one of the best-loved American storytellers
with "became" as the verb

If you look at the surrounding words, you can get a general basis of what another word for inviolate would be. i would say that it is pristine