Complex sentence: The distal end of the radius is large, of quadrilateral form, and provided with two articular surfaces-one below, for the carpus, and another at the medial side, for the ulna.
Split into simpler sentences: The distal end of the radius is large and of quadrilateral form. It is provided with two articular surfaces-one below, for the carpus, and another at the medial side, for the ulna.