However” is a conjunctive adverb. Conjunctive adverbs are adverbs that act in a similar way to conjunctions, linking the ideas in two sentences or statements together. To join two independent clauses together with a conjunctive adverb, use a period or a semicolon after the first clause and a comma after the conjunctive adverb. For example, “the cat chased the mouse; however, the mouse got away.