The second option is correct. "Pluto, which appeared to be a planet, was found to be a somewhat ordinary piece of space rock."
The underlined portion of the sentence is described first by the term The parto of the sentence that is appositive is in between commas.The second term is clause.The part that is underlined is called a because it gives additional information about the main clause.
I disagree because if you cut off ties from your culture and your past, you're only setting yourself up for failure. You are prone to make the same mistakes again. The past helps shape your future.
The sentence given is an example of a complex sentence. A complex sentence consists of an independent clause and one or more dependent clauses. In the sentence, the independent clause is: Mr. Smith sang the same song every night until eight o'clock. And the dependent clause is: Besides eating ice cream cones on Saturday.