Complex sentence: If a celebrity guessed one name correctly, the contestant won $500, which doubled to $1,000 if two names were guessed correctly, and then $2,000 if three names were guessed correctly.
Split into simpler sentences: If a celebrity guessed one name correctly, the contestant won $500. The contestant won $1,000 if two names were guessed correctly, then $2,000 if three names were guessed correctly.