Answer: The option that revises the sentence to create a new, complex sentence is the third one: Based on the scientists’ recommendations, the new safety requirements were enacted so that the number of accidents diminished.
Explanation: A complex sentence is a sentence made up of an independent clauses and a dependent clause. However, unlike an independent clause, a dependent clause cannot stand alone as a sentence because it does not present a complete thought. Moreover, a dependent clause is introduced by a subordinating conjunction.<u> The sentence "Based on the scientists’ recommendations, the new safety requirements were enacted so that the number of accidents diminished" revises the sentence provided</u>, which was only made up of an independent clause, by including a dependent clause and transforming it into a complex sentence. <u>The dependent clause in the new sentence is "so that the number of accidents diminished" and the subordinating conjunction that introduces it is "so that"</u>.
