Sentence:  The material of the Porter film is simplicity itself ; much of it has continued to be <WSD>used</WSD> over the years and the heart of it - good guys and bad guys in the old West - pretty well dominated television toward the end of the 1950's . 
Meaning of the word marked with <WSD> tags:  put into service; make work or employ for a particular purpose or for its inherent or natural purpose