Complex sentence: England's sister, a New York City resident, met the actress once, and relayed to her the history and story of the band, signing an autograph for them, saying in response to the story, "Oh that's cool".
Split into simpler sentences: England's sister, a New York City resident, met the actress once, and relayed to her the history and story of the band. Signing an autograph for them, she said in response to the story, "Oh, that's cool".