Complex sentence: This "whole-body" vomiting creates the unique sound "HOARK", not to be confused with the retching sound "BLEAC" in which only muscles of the upper torso and (particularly) the neck are involved.
Split into simpler sentences: This "whole-body" vomiting creates the unique sound "HOARK". Not to be confused with the retching sound "BLEAC" in which only muscles of the upper torso and (particularly) the neck are involved.