connect it to the sentence before or after it. A dependent clause fragment is something incomplete, as the name itself says. This means that it needs to be a part of a larger, independent sentence, in order to be complete and make sense.
Delete the subordinating conjunction, thus making the dependent clause an independent clause, which can stand alone. Connect the dependent clause to a nearby independent clause.
Producing plastics benefits the economy by employing workers and helps the economy of every state by spending billions of dollars on shipping plastic products.