The executive director of a nonprofit, also known as the groupâs chief executive officer, is responsible for developing the nonprofitâs direction and vision. The exact duties of an executive director can vary depending on the size of the organization.
These two sentences can be combined into a compound sentence with a semicolon, appropriate conjunctive adverb, and comma. Like the coordinating conjunction, each conjunctive adverb has an individual meaning; thus, you should use whichever one fits the sense of the sentence you are writing.
This last type of compound sentence is the one we will concentrate on for comma use. A compound sentence must have two independent clauses  not just two verbs, two nouns, or two groups of words that are not independent clauses. Look at this example. In the above example, two verb groups are being joined by and.