Challenged by another thread, I wondered how many (correct) spellings there are for das / Auto / fahren / lernen (i.e. sentences with these words in that particular order).
I found three.
Er muss das Auto fahren lernen.
"das" refers to: das Auto
He has to learn to drive the car.
He has to learn to drive that particular car.
Er muss das Autofahren lernen.
"das" refers to: das Autofahren, das Fahren.
(He has to learn the "driving a car".)
He has to learn to drive a car.
Das Auto-fahren-Lernen ist nicht leicht.
"das" refers to: das Auto-fahren-Lernen, das Lernen.
It is spelled with hyphens because of §43.
(The "learning how to drive a car" is not easy.)
It't not easy to learn to drive a car.
To continue the pattern of 1. and 2.
Er muss das Auto-fahren-Lernen ernster nehmen.
(He has to take the "learning how to drive a car" more seriously.)