Complex sentence: The three girls had to perform an A cappella of Pocketful of Sunshine by Natasha Bedingfield, in front the former contestants of the show, and the twist was that one of the girls would be dropped.
Split into simpler sentences: The three girls had to perform an A cappella of Pocketful of Sunshine by Natasha Bedingfield. They had to perform in front the former contestants of the show, and the twist was that one of the girls would be dropped.