Complex sentence: Brainwave entrainment has been noted or used in one form or another for centuries, from Shamanistic societies' use of drum beats to Ptolemy noting in 200 A.D. the effects of flickering sunlight generated by a spinning wheel.
Split into simpler sentences: Brainwave entrainment has been noted or used in one form or another for centuries. From Shamanistic societies use of drum beats to Ptolemy noting in 200 A.D. the effects of flickering sunlight generated by a spinning wheel.