Complex sentence: Lorde said she wanted to get a fancy sound designer to put the listener in a party and give off the feeling of walking away from the party to a hall and shut the door into a room and deliver a verse and chorus of the song.
Split into simpler sentences: Lorde said she wanted to find a "fancy sound designer" to put the listener in a party. She wanted to evoke the feeling of her walking away from said party down a hall, finding a room and shut the door into a room and deliver a verse and chorus of the song.