Complex sentence: The metal--oxide--semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET) is a type of transistor used for amplifying or switching electronic signals which has an insulated gate whose voltage determines the conductivity of the device.
Split into simpler sentences: The metal--oxide--semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET) is a type of field-effect transistor (FET). It has an insulated gate, whose voltage determines the conductivity of the device.