Complex sentence: They reveal that it is makeover time, but there are a few twists: the girls are allowed to choose whether or not they want to receive a makeover, and the make overs will not be reveal until after everyone has made their decision.
Split into simpler sentences: They reveal that it is makeover time, but that there will be a few twists. The girls are allowed to choose whether or not they want to receive a makeover, but the make overs will not be revealed until after everyone has made their decision.