CREATE TABLE table_65214 ("Nat." CLOB, "Name" CLOB, "Type" CLOB, "Transfer window" CLOB, "Transfer fee" CLOB)

Marcell Jansen with a transfer window of summer, and of transfer as type is from what nation?
SELECT "Nat." FROM table_65214 WHERE "Transfer window" = 'summer' AND "Type" = 'transfer' AND "Name" = 'marcell jansen'
SELECT "Nat." FROM "table_65214" WHERE "Name" = 'marcell jansen' AND "Transfer window" = 'summer' AND "Type" = 'transfer'