Complex sentence: Jasmine rice, though grown in Laos and southern Vietnam, is not the predominant rice variety; glutinous rice is grown in Laos, and regular "Oryza sativa" predominates in Vietnam.
Split into simpler sentences: Jasmine rice, though grown in Laos and southern Vietnam, is not the predominant rice variety. Glutinous rice is grown in Laos, and regular "Oryza sativa" predominates in Vietnam.