Complex sentence: Hydrostatic CVTs are usually not used for extended duration high torque applications due to the heat that is generated by the flowing oil, although there are a variety of oil cooler designs to help counter this problem.
Split into simpler sentences: Hydrostatic CVTs are usually not used for extended duration high torque applications due to the heat that is generated by the flowing oil. Although there are a variety of oil cooler designs to help counter this problem.