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 has never been a need to defend St. Barts.  
( There ( ( ( has never ) ( been ( a ( need ( to ( defend ( St. Barts ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBZ has) (ADVP (RB never)) (VP (VBN been) (NP (DT a) (NN need) (S (VP (TO to) (VP (VB defend) (NP (NNP St.) (NNP Barts)))))))) (. .)))