Help with sentence clarity?

Here’s the sentence.

The novel does not simply state that fate or Henchard’s own choices are the results of his own downfall; instead the author’s feelings are shown through other characters around Henchard in Casterbridge.

I feel like that isn’t a very clear sentence… is it a run-on sentence? I honestly can’t tell. I’ve gone through my MLA handbook and the guidelines, and I haven’t found anything.