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.
Youthful inventor Joshua Lionel Cowen wasn't the first to manufacture toy trains and he did not lack for competition. Carlisle & Finch Co., of Cincinnati, OH, first made electric trains in 1896 and German toy manufacturers such as Bing and Marklin were producing electric and steam-powered toy trains.