Complex sentence: The Yeah Yeah Yeahs are an American indie rock band formed in New York City in 2000, and is composed of vocalist and pianist Karen O, guitarist and keyboardist Nick Zinner, and drummer Brian Chase.
Split into simpler sentences: The Yeah Yeah Yeahs are an American indie rock band formed in New York City in 2000. Since their inception, the band has been composed of vocalist and pianist Karen O, guitarist and keyboardist Nick Zinner and drummer Brian Chase.