Complex sentence: In roots, an increase in the concentration of auxin will inhibit cell expansion, therefore, the redistribution of auxin in the root can initiate differential growth in the elongation zone resulting in root curvature.
Split into simpler sentences: In roots, an increase in the concentration of auxin will inhibit cell expansion. Therefore, the redistribution of auxin in the root can initiate differential growth in the elongation zone, resulting in root curvature.