Complex sentence: Some languages have only a single hushing sibilant and no hissing sibilant, such as southern peninsular Spanish dialects of the "ceceo" type, which have replaced the former hissing fricative with, leaving only.
Split into simpler sentences: Some languages have only a single hushing sibilant and no hissing sibilant. That occurs in southern Peninsular Spanish dialects of the "ceceo" type, which have replaced the former hissing fricative with, leaving only.