Complex sentence: Scattering depends on the relative orientations of the electron spins and those magnetic moments: it is weakest when they are parallel and strongest when they are antiparallel; it is relatively strong in the paramagnetic state, in which the magnetic moments of the atoms have random orientations.
Split into simpler sentences: Scattering depends on the relative orientations of the electron spins and magnetic moments of the atoms: it is weakest when they are parallel and strongest when they are antiparallel. The scattering is relatively strong in the paramagnetic state, in which the magnetic moments of the atoms have random orientations.