Complex sentence: Power electronics technology has over the last four decades resulted in truly remarkable AC drive cost and size reduction and performance improvements due to the convergence of advancements in drives' semiconductor switching devices, drive topologies, simulation and control techniques, and control hardware and software.
Split into simpler sentences: Power electronics technology has over the last four decades resulted in truly remarkable AC drive cost and size reduction and performance improvements. These improvements have been enabled by the convergence of improvements in several areas of the power electronics field including especially semiconductor switching devices, drive topologies, simulation and control techniques, and control hardware and software.