St. Barts, of course, is completely undefended.
( ( ( ( ( St. Barts ) , ) ( of course ) ) , ) ( ( is ( completely undefended ) ) . ) )
(ROOT (S (NP (NP (NNP St.) (NNP Barts)) (, ,) (PP (IN of) (NP (NN course))) (, ,)) (VP (VBZ is) (ADJP (RB completely) (JJ undefended))) (. .)))
There are no defenses in St. Barts.  
( There ( ( are ( ( no defenses ) ( in ( St. Barts ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (DT no) (NNS defenses)) (PP (IN in) (NP (NNP St.) (NNPS Barts))))) (. .)))