Sentence:  The material of the Porter <WSD>film</WSD> is simplicity itself ; much of it has continued to be used 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:  a form of entertainment that enacts a story by sound and a sequence of images giving the illusion of continuous movement