Complex sentence: In Samuel Johnson's "Rasselas", the main character is a prince of Ethiopia who is interned in a mountain sanctuary called the "Happy Valley"; to explore the world and find his own happiness, he escapes.
Split into simpler sentences: In Samuel Johnson's "Rasselas", the main character is a prince of Ethiopia who is interned in a mountain sanctuary called the "Happy Valley". To explore the world and find his own happiness, he escapes.