Complex sentence: This species of barnacle is short-lived because it dies when the sea snake sheds its skin; as the skin is sloughed every four to six weeks, it is presumed that the barnacle completes its life cycle in this period.
Split into simpler sentences: This species of barnacle is short-lived because it dies when the sea snake sheds its skin. As the skin is sloughed every four to six weeks, it is presumed that the barnacle completes its life cycle in this period.