You are sent damaged goods. The store must replace the items. Otherwise, it must issue a full refund.（compound-complex sentence)
When you are sent damaged goods, the store must replace the items, or it must issue a full refund.
You are sent damaged goods. The store must replace the items. Otherwise, it must issue a full refund.（compound-complex sentence)
When you are sent damaged goods, the store must replace the items, or it must issue a full refund.
