How do I split a long PL/pgSQL line of code over multiple lines?
String constants can be split over multiple lines as documented in the manual

INSERT INTO insert_log (log_time, description)
VALUES (
    now()
    , 'A description. Made up of 3 semi long sentences. '
      'That I want to split, in the code, not in the log table, '
      'over 3 lines for readability.'
);