Complex sentence: In the regulation of heating and cooling, thermostats that operate over a wide range of temperatures the bimetal strip is mechanically fixed and attached to an electrical power source while the other (moving) end carries an electrical contact.
Split into simpler sentences: In the regulation of heating and cooling, thermostats that operate over a wide range of temperatures are used. In these, one end of the bimetal strip is mechanically fixed and attached to an electrical power source, while the other (moving) end carries an electrical contact.