Complex sentence: After the destruction of Númenor, the Undying Lands were removed from Arda so that Men could not reach them and only the Elves could go there by the Straight Road and in ships capable of passing out of the spheres of the earth.
Split into simpler sentences: After the destruction of Númenor, the Undying Lands were removed from Arda so that Men could not reach them. The Elves could go there only by the Straight Road and in ships capable of passing out of the spheres of the earth.