Is this a run-on sentence?
My favorite furniture company offers more than one hundred different fabrics to choose from you can order free fabric swatches to see what looks best with your decor.

 - yes
 - no
This is a run-on sentence. It is formed from two sentences run together, joined without punctuation.
My favorite furniture company offers more than one hundred different fabrics to choose from you can order free fabric swatches to see what looks best with your decor.
Here is one way to fix the run-on sentence:
My favorite furniture company offers more than one hundred different fabrics to choose from, and you can order free fabric swatches to see what looks best with your decor.