When foreigners enter Japan, they must apply for a landing permit at the airport where they arrived.
Literal
Foreigners [subject-が] Japan [to-に] land time [topic-は], arrived airport [etc.-等] [at-で] landing-permit [possessive-の] application [object-を] carry-out-must-[obligation-なりません].
Official immigration language. 上陸 ('landing') is the legal term for entering the country — literally 'going ashore,' a holdover from when entry was primarily by ship. 上陸許可 is the formal term for immigration clearance. 行わなければなりません is the maximally formal obligation chain: 行う + なければ + なりません. Bureaucratic Japanese stacks these formal layers naturally.