Complex sentence: Sessrúmnir is secondly referred to in chapter 20 of the "Prose Edda" book "Skáldskaparmál", means of referring to Freyja are given, including a reference to Sessrúmnir: "possessor of the fallen slain and of Sessrúmnir (...)".
Split into simpler sentences: Sessrúmnir is secondly referred to in chapter 20 of the "Prose Edda" book "Skáldskaparmál". In the chapter, means of referring to Freyja are given, including a reference to Sessrúmnir: "possessor of the fallen slain and of Sessrúmnir (...)".