Complex sentence: The walking or stepping reflex is present at birth; though infants this young cannot support their own weight, when the soles of their feet touch a flat surface they will attempt to'walk' by placing one foot in front of the other.
Split into simpler sentences: The walking or stepping reflex is present at birth; though infants this young cannot support their own weight. When the soles of their feet touch a flat surface they will attempt to'walk' by placing one foot in front of the other.