Complex sentence: He spends only a few nights in the town, impatient to reach Madrid via the long climb through the Sierra de Guadarrama mountains finally getting a lift from two young booksellers in their van.
Split into simpler sentences: He spends only a few nights in the town because he is impatient to reach Madrid. He makes the long climb through the Sierra de Guadarrama mountains and is finally given a lift by two young booksellers in their van.