original: However, the mineralogy of the X-type asteroids is not known well enough to constrain this further.
simplifications: X-type asteroid mineralogy cannot be driven further. it is not well known enough. The mineralogy of the X-type asteroids is not known well enough to prove that. The mineralogy of X-type asteroids aren't known enough to constrain this further. The X-type asteroid mineralogy is not known well enough. However, the mineralogy of the X-type asteroids is not well known enough to restrict this any more. However, the mineral content of the X-type asteroids is not known enough to constrain this more. We do not know enough about the minerals in X-type asteroids to constrain this further. The mineralogy of the X-type asteroids is not known well enough to restrict this further. The mineralogy of X-type asteroids is not known enough to establish this fact. The mineralogy of the X-type asteroids, however, is not well known enough to further restrict this.