Yes, that is exactly what you should tell them. 1  If two clauses are connected with a coordinating conjunction, it's a compound sentence. 2  If two clauses are connected with a subordinating conjunction, it's a complex sentence.
Trains were first- 1784, but cars weren't invented until 1890.
First class travel. First class observation car Juno on the Nebraska Zephyr. First class is the most luxurious travel class of seats and service on a train, passenger ship, airplane, bus, or other system of transport. It is usually more expensive than business class and economy class, and offers the best service and luxurious accommodation.