Complex sentence: The neuroimaging techniques mainly used in dyslexia research have been functional Magnetic Resonance Imaging (fMRI) and positron emission tomography (PET), which have produced clear evidence of structural differences in the brains of children with reading difficulties.
Split into simpler sentences: The neuroimaging techniques mainly used in dyslexia research have been functional Magnetic Resonance Imaging (fMRI) and positron emission tomography (PET). Which have produced clear evidence of structural differences in the brains of children with reading difficulties.