Complex sentence: Longevity is a survival strategy in the challenging Australian environment that ensures that most adults participate in at least one exceptional spawning and recruitment event, which are often linked to unusually wet "La Niña" years and may only every one or two decades.
Split into simpler sentences: Longevity is a survival strategy in the often challenging Australian environment which ensures that most adults participate in at least one exceptional spawning and recruitment event. These events are often linked to unusually wet "La Niña" years and may only every one or two decades.