Before revision:  While the experimental research on the development of such devices has progressed remarkably, simulation of these devices is still challenging due to the high computational cost resulting from modeling and discretization of complicated physical processes and intricate  geometries.
After revision:  While the experimental research on the development of these devices has progressed remarkably, simulation of these devices is still challenging due to the high computational cost resulting from modeling and discretization of complicated physical processes and intricate geometries.