Complex sentence: To native speakers, it is known only as Maya-- "Yucatec" is a tag linguists use to distinguish it from other Mayan languages (such as K'iche' and Itza' Maya).
Split into simpler sentences: To native speakers, proper name is Maya and it is known only as Maya. The qualifier "Yucatec" is a tag linguists use to distinguish it from other Mayan languages (such as K'iche' and Itza' Maya).