This Sentence Will Make You Smarter: Compound Sentence with a Conjunctive Adverb

Pattern:    Indep. Clause; therefore, Indep. Clause

L. Frank Baum wrote The Wizard of Oz for his daughter; however, the book was much more than a child's story.

I think; therefore, I am.

Conjunctive Adverbs:  thus, for example, therefore, however, then, in fact, meanwhile, also, as a result