Complex sentence: The estelada (full name "senyera estelada", from "estel", "star" in Catalan) is an unofficial flag typically waved by Catalan independentists to express their support for an either independent Catalonia or independent "Països Catalans".
Split into simpler sentences: The estelada (full name "senyera estelada", from "estel", "star" in Catalan) is an unofficial flag. As such, it is typically waved by Catalan independentists to express their support for an either independent Catalonia or independent "Països Catalans".