I think it seems to be a straight forward mapping. Try the below and see if it works.
Create the source and destination schemas with value of max occurs for “address” element under “addresses” to unbounded. Map the elements “to”, “country” and “address” in source schema to “to”, “country” and “addr” in destination schema. (Assuming that value of maxOccurs for “to” and “country” in source schema is 1).