Complex sentence: The main problem here is one of discrimination, of distinguishing different perceptual features (acoustic elements) of a sound that combine to enable us to recognise the sound, e.g. problems with temporal resolution... (Albert and Bear, 1974).
Split into simpler sentences: The main problem here is in distinguishing different perceptual features, ie the acoustic elements of a sound that combine to allow us to recognise it. For example problems with temporal resolution were identified by (Albert and Bear, 1974).