Complex sentence: Interlanguage can be observed to be variable across different contexts; for example, it may be more accurate, complex and fluent in one discourse domain than in another (Tarone, 1979; Selinker & Douglas, 1985).
Split into simpler sentences: Interlanguage can be observed to be variable across different contexts. For example, it may be more accurate, complex and fluent in one discourse domain than in another (Tarone, 1979; Selinker & Douglas, 1985).