Complex sentence: It's a projection in which the spherical surface of the earth is divided into eight octants, each flattened into the shape of a Reuleaux triangle on an elastic support, being able to roughly cover with them the surface of an earth's globe.
Split into simpler sentences: It's a projection in which the spherical surface of the earth is divided into eight octants, each flattened into the shape of a Reuleaux triangle. If transferred to an elastic support, it would be possible to cover with them the surface of an earth's globe.