Complex sentence: The sharp downward deflection, due to gravitational pull, in the tail end of the yorker's trajectory causes difficulty in judging the length, whereas a flat delivery that lands near a batsman's feet can be judged and played without much difficulty.
Split into simpler sentences: The sharp downward deflection, due to gravitational pull, in the tail end of the yorker's trajectory cause batsmen difficult to judge the length. Whereas a flat delivery that lands near batsman's feet can be judged and played without much difficulty.