Many craft families stopped their business. There is the economic crisis in the world. (because) 
(because)

=> Many craft families stopped their business because there is the economic crisis in the world. 
 

Viet Nam began integrating into the international economy a few decades ago. Production
in craft villages developed strongly, meeting demand for domestic decoration, and
construction. (when)

=> When Viet Nam began integrating into the international economy a few decades ago, production in craft villages developed strongly, meeting demand for domestic decoration, and construction.
7. At the age of over 80, the artisan is instructing the craft to his grandchildren. He wants them
to preserve this ancient craft. (so that)

=> At the age of over 80, the artisan is instructing the craft to his grandchildren so that he wants them to preserve this ancient craft.
8. The workers have taken several steps to whiten the palm leaves. They sew together the
leaves and the rings. (after)

=> After the workers have taken several steps to whiten the palm leaves, they sew together the leaves and the rings.
9. The conical hat has several useful functions. It protects the wearer's head and face from
sunlight or rain, and it also works as a handy fan on hot summer days. (because)

=> The conical hat has several useful functions because it protects the wearer's head and face from sunlight or rain, and it also works as a handy fan on hot summer days.