Complex sentence: At the turn of the millenium, Bender's discovery of and work on the importance of non-Hermitian parity-time (PT) symmetric quantum systems has led to major experimental advances and applications in optics.
Split into simpler sentences: At the turn of the millenium, Bender discovered the importance of non-Hermitian parity-time (PT) symmetric quantum systems. His work has led to major experimental advances and applications in optics.