Complex sentence: Known as "the collapsed pyramid", sometime in antiquity the outer layers of the casing collapsed, leaving the exposed core showing, because of its appearance it is called "el-haram el-kaddab"--("False Pyramid") in Arabic.
Split into simpler sentences: Known as "the collapsed pyramid", the outer layers of the casing began to collapse, leaving the exposed core showing. Because of its appearance, it is called "el-haram el-kaddab"--("False Pyramid") in Arabic.