Complex sentence: Only languages which have allophonic differences associated with grammatical boundaries have juncture as a phonological element; it is claimed that French does not have this, so that, for example, "and" (phonemically both) are phonetically identical.
Split into simpler sentences: Only languages which have allophonic differences associated with grammatical boundaries have juncture as a phonological element. It is claimed that French does not have that so, for example, "and" (phonemically both) are phonetically identical.