Complex sentence: Lee and her crew were able to retain some of their footage from the Israeli naval attack on the Mavi Marmara, which was subsequently released at the United Nations Correspondents' Association in New York City.
Split into simpler sentences: Lee and her crew were able to retain some of their footage from the Israeli naval attack on the Mavi Marmara. This tape was subsequently released at the United Nations Correspondents' Association in New York City.