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.
1 1803 â First public railway was created in London. It transported goods via horse power on the line that was 14 km long.  1804 â Englishman Matthew Murray created first steam based locomotive in Leeds. Richard Trevithick showcased his locomotive in public.