If a classroom has hard walls and ceiling, no carpeting, and limited sound-absorbing materials on the walls, reverberation can create significant interference.
(a classroom; has; hard walls and ceiling, no carpeting, and limited sound-absorbing materials on the walls) (reverberation; can create; significant interference)
a classroom reverberation
has can create
hard walls and ceiling, no carpeting, and limited sound-absorbing materials on the walls
significant interference