Complex sentence: Circadian rhythms occur as a plant entrains to synchronize with the light cycle of its surrounding environment, are endogenously generated and self-sustaining, and are relatively constant over a range of ambient temperatures.
Split into simpler sentences: Circadian rhythms occur as a plant entrains to synchronize with the light cycle of its surrounding environment. These rhythms are endogenously generated and self-sustaining and are relatively constant over a range of ambient temperatures.