Complex sentence: In humans and animals, dermatoglyphs are present on fingers, palms, toes and soles, giving insight into a critical period of embryogenesis, between 4 weeks and 5 months, when the architecture of the major organ systems is developing.
Split into simpler sentences: In humans and animals, dermatoglyphs are present on fingers, palms, toes and soles. This gives insight into a critical period of embryogenesis, between 4 weeks and 5 months, when the architecture of the major organ systems is developing.