Complex sentence: She wrote the lyrics to "Royals" at her house in only half an hour, and was also listening to a lot of rap and hip-hop-influenced music, especially Lana Del Rey, while writing.
Split into simpler sentences: She wrote the lyrics to "Royals" at her house in only half an hour. She was listening to a lot of rap and hip-hop-influenced music, especially Lana Del Rey, while writing.