Complex sentence: Degree of reaction can be defined as the ratio of pressure energy change in the blades to total energy change of the fluid.this means that it is basically a ratio indicating the fraction of total change in fluid pressure energy occurring in the blades of the turbine.
Split into simpler sentences: Degree of reaction can be defined as the ratio of pressure energy change in the blades to total energy change of the fluid. This means that it is basically a ratio indicating the fraction of total change in fluid pressure energy occurring in the blades of the turbine.