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.
In the US, electric trams (trolley cars) were first successfully tested in service in Richmond, Virginia, in 1888, in the Richmond Union Passenger Railway built by Frank J. Sprague.Another was by John Joseph Wright, brother of the famous mining entrepreneur Whitaker Wright, in Toronto in 1883. Welsh example of a tram was usually known as the Mumbles Train, or more formally as the Swansea and Mumbles Railway. Built as the Oystermouth Railway in 1804, on 25 March 1807 it became the first passenger-carrying railway in the world.