Complex sentence: Tinajero has served as president of the National Association for Bilingual Education (NABE) and has worked as a professor of bilingual education at the University of Texas at El Paso (UTEP).
Split into simpler sentences: Tinajero has served as president of the National Association for Bilingual Education (NABE). She has worked as a professor of bilingual education at the University of Texas at El Paso (UTEP).