Original sentence: Two pianos and cello: a slowly-moving cello melody (which evokes the swan elegantly gliding over the water) is played over rippling sixteenths in one piano and rolled chords in the other (said to represent the swan's feet, hidden from view beneath the water, propelling it along)
Edited sentence: Two pianos and cello: a slowly moving cello melody (which evokes the swan elegantly gliding over the water) is played over rippling sixteenths in one piano and rolled chords in the other (said to represent the swan's feet, hidden from view beneath the water, propelling it along)