Answer:
This sentence features a comma splice.
Step-by-step explanation:
A comma splice occurs when two independent clauses are joined together with a comma. In other words, when the writer tries to join two complete sentences with a comma. This is incorrect. In order to fix this sentence, we would have to change the comma to a period or a semicolon. The following are correct.
Everyone should join a service club. It is a great way to improve the world.
Everyone should join a service club; it is a great way to improve the world.
We could also add a coordinating conjunction to correct the sentence.