Complex sentence: Life science is the study of living things.The life sciences the comprise all fields of science that involve the scientific study of living organisms, like plants, animals, and huyopsychology, is only included in as much as it involves a clearly biological aspect.
Split into simpler sentences: Life science is the study of living things.The life sciences the comprise all fields of science that involve the scientific study of living organisms, like plants, animals, and human beings. However, the study of behaviour of organisms, such as practised in ethology and psychology, is only included in as much as it involves a clearly biological aspect.