Sometimes you’ll hear people suggest you should design short pages to save people the trouble of having to scroll down.
Testing referred to by Google on their Webmaster blog indicates that people prefer scrolling longer pages than having to navigate from one page to the next:
User testing has taught us that searchers much prefer the view-all, single-page version of content over a component page containing only a portion of the same information with arbitrary page breaks (which cause the user to click “next” and load another URL).
Read the full article here: View All in Search Results.
As always, the basic rule should be that you only use as much content as required to communicate what is needed. But if you do need more copy to get your point across, don’t feel compelled to break up the thought into separate pages just to avoid scrolling.