For example

Gulliver's Travels: Travels into Several Remote Nations of the World. In Four Parts. By Lemuel Gulliver, First a Surgeon, and then a Captain of Several Ships

and

Robinson Crusoe: The Life and Strange Surprizing Adventures of Robinson Crusoe, Of York, Mariner: Who lived Eight and Twenty Years, all alone in an un-inhabited Island on the Coast of America, near the Mouth of the Great River of Oroonoque; Having been cast on Shore by Shipwreck, wherein all the Men perished but himself. With An Account how he was at last as strangely deliver'd by Pyrates.

How did we transition to modern titles which are mostly single words or phrases that tell you almost nothing about the contents. Further information being provided on the synopsis on the back.

A tangential question: when did numbered sequels come into use? For example, Terminator 2 or GTAII.

It's hard to imagine a "Pride and Prejudice 2"