Complex sentence: While theoretically immersion and maintenance schools correspond to the students initial first language, in practice this distinction may not be as clear as communities that are undergoing language shift while have both children who are bilingual before school, or speak only the majority or minority language.
Split into simpler sentences: While theoretically immersion and maintenance schools correspond to the students' first language, in practice this distinction may not be as clear in communities that are undergoing language shift. Such communities may have both children who are bilingual before school, as well as those who speak only the majority or minority language.