Complex sentence: If we consider a hexagon to be constructed from six binary links with six of the seven joints forming its vertices, then, the seventh joint can be added to connect two sides of the hexagon to forming a six-bar linkage with two ternary joints.
Split into simpler sentences: If we consider a hexagon to be constructed from six binary links with six of the seven joints forming its vertices. Then, the seventh joint can be added to connect two sides of the hexagon, thus forming a six-bar linkage with two ternary joints.