Complex sentence: Specifically, Mandarin features lexical tones that must be used with every syllable which in turn convey meaning; in Mandarin and other tonal languages, mothers use CDS by heightening the pitch of speaking making the product easier for infants to understand.
Split into simpler sentences: Specifically, Mandarin features lexical tones that must be used with every syllable which in turn convey meaning. It has been seen that in tonal languages such as in this example mothers use child directed speech by heightening the pitch of speaking making the product easier for infants to understand.