
anlangen
to arrive
To arrive or reach a destination. It is a somewhat more formal or elevated variant of 'ankommen' (to arrive).
Sobald wir am Bahnhof anlangen, geben wir Bescheid.
As soon as we arrive at the station, we'll let you know.
to arrive / concern
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to arrive
To arrive or reach a destination. It is a somewhat more formal or elevated variant of 'ankommen' (to arrive).
Sobald wir am Bahnhof anlangen, geben wir Bescheid.
As soon as we arrive at the station, we'll let you know.

as for
In the fixed expression 'was ... anlangt' (as for / concerning ...), it means 'betreffen' (to concern) or 'angehen' (to concern) and introduces a topic.
Was die Finanzierung des Projekts anlangt, gibt es noch einige offene Fragen.
As for the financing of the project, there are still some unanswered questions.
'Anlangen' (to arrive / concern) is a separable verb. The prefix 'an-' comes at the end in a main clause. In subordinate clauses and in the infinitive, the verb stays together.
Der Zug langt pünktlich am Gleis 5 an.
The train arrives on time at platform 5.
In the meaning 'ankommen' (to arrive), 'anlangen' is mainly used in written language or in a formal, slightly elevated style.
Die Gäste werden gegen Mittag im Hotel anlangen.
The guests will arrive at the hotel around noon.
The expression 'was ... anlangt' (as for / concerning ...) is a fixed structure used to introduce a topic. The verb 'anlangt' always comes at the end of the introductory clause.
Was deine Frage anlangt, so kann ich sie noch nicht beantworten.
As for your question, I cannot answer it yet.
to concern / affect
Both expressions can show that a statement concerns a particular topic. „Betreffen“ is used as a regular verb directly with the topic or person, while „was ... anlangt“ is a fixed, somewhat more formal expression for introducing a topic. Use this expression only with the corresponding sentence structure.

Was die neuen Mitarbeiter anlangt, gelten besondere Regeln.
As for the new employees, special rules apply.
Die Änderungen betreffen vor allem die neuen Mitarbeiter.
The changes mainly affect the new employees.