Complex sentence: Another possible allusion comes in the form of a sonar-ping sound effect utilized throughout the series--the intro to Echoes was devised from an experiment where the band tried to recreate that particular sound on a grand piano.
Split into simpler sentences: Another possible allusion comes in the form of a sonar-ping sound effect utilized throughout the series. The intro to Echoes was devised from an experiment where the band tried to recreate that particular sound on a grand piano.