Original: Comparing SOS (di-di-di-dah-dah-dah-di-di-dit) with the older CQD (dah-di-dah-dit dah-dah-di-dah dah-di-dit) (— · — · / — — · — / — · ·) it is obvious how much simpler the new code was.
Simplified: SOS (· · · — — — · · ·) is a Morse code. Comparing SOS (di-di-di-dah-dah-dah-di-di-dit) with the older CQD (dah-di-dah-dit dah-dah-di-dah dah-di-dit) (— ·—· /—— ·—/—· ·) it is obvious how much simpler the new code is.