In other words, as you stand on the surface of the Earth, the gravity of the Earth pulls you as if all the mass of the Earth were concentrated at a point in its center.
(you; stand; on the surface of the Earth) (the gravity of the Earth; pulls; you; T:as if all the mass of the Earth were concentrated at a point in its center) (all the mass of the Earth; were concentrated; L:at a point in its center)
you the gravity of the Earth all the mass of the Earth
stand pulls were concentrated
on the surface of the Earth
you T:as if all the mass of the Earth were concentrated at a point in its center
L:at a point in its center