Complex sentence: High Power means that your batsmen have the meat to hit long 4's and many 6's, and when used in correlation to other attributes like Hitting, Stamina and Control for a batsmen, makes it in many managers opinions, the most useful attribute.
Split into simpler sentences: High Power means that your batsmen have the meat to hit long 4's and many 6's. When taken in conjunction with other attributes (like Hitting, Stamina, and Control) it is, in many managers opinions, the most useful attribute.