Complex sentence: According to "The Silmarillion", Anglachel (meaning "Iron of the Flaming Star" in Sindarin) was one of the two swords forged by Eöl the Dark Elf out of a black meteorite: the other, Anguirel, he kept for himself.
Split into simpler sentences: According to "The Silmarillion", Anglachel (meaning "Iron of the Flaming Star" in Sindarin) is a sword forged by Eöl the Dark Elf. It was one of two swords Eöl forged out of a black meteorite: the other, Anguirel, he kept for himself.