Complex sentence: It can be seen as the "lid" of an icosahedron; the rest of the icosahedron forms a gyroelongated pentagonal pyramid, "J" 11, one of the 92 Johnson solids named and described by Norman Johnson in 1966.
Split into simpler sentences: It can be seen as the "lid" of an icosahedron; the rest of the icosahedron forms a gyroelongated pentagonal pyramid, "J" 11. The 92 Johnson solids were named and described by Norman Johnson in 1966.