Simplify the following text for a Grade 11 native English-speaking person.
Original: The availability of high-powered semiconductors ( such as thyristors and the IGBT ) has now made practical the use of much simpler , higher-reliability AC induction motors known as asynchronous traction motors . Synchronous AC motors are also occasionally used , as in the French TGV .
Simplified: AC induction motors known as asynchronous traction motors .