Complex sentence: The McGurk effect is a perceptual phenomenon which indicates an interaction between hearing and vision in speech perception, and therefore suggests that speech perception is multimodal-that it involves information from more than one sensory modality.
Split into simpler sentences: The McGurk effect is a perceptual phenomenon which indicates an interaction between hearing and vision in speech perception. It suggests that speech perception is multimodal; it involves information from more than one sensory modality.