Complex sentence: Pakistan managed to procure around 90 Canadair CL-13 Sabre Mk 6 illegally from West Germany through Iran, these formed the backbone of the operations during the 1971 Indo-Pakistani War.
Split into simpler sentences: Pakistan managed to procure around 90 Canadair CL-13 Sabre Mk 6 from West Germany. These formed the backbone of the operations during the 1971 Indo-Pakistani War.