Complex sentence: The bar magnet is placed in a vessel containing a liquid to be stirred, and the vessel is set on top of the stand, where a rapidly oscillating magnetic field causes the bar magnet to spin at high speed.
Split into simpler sentences: The bar magnet is placed in a vessel containing a liquid to be stirred. The vessel is set on top of the stand, where a rapidly rotating magnetic field causes the bar magnet to spin at high speed.