Complex sentence: The section lift coefficient is based on two-dimensional flow-the concept of a wing with infinite span and non-varying cross-section, the lift of which is bereft of any three-dimensional effects, and defined per unit span of the wing l\\,.
Split into simpler sentences: The section lift coefficient is based on two-dimensional flow-the concept of a wing with infinite span and non-varying cross-section, the lift of which is bereft of any three-dimensional effects. Rather, the lift is defined per unit span of the wing l\\,.