The case law is a whole body unto itself.
( ( The ( case law ) ) ( ( is ( ( a ( whole ( body unto ) ) ) itself ) ) . ) )
(ROOT (S (NP (DT The) (NN case) (NN law)) (VP (VBZ is) (NP (NP (DT a) (JJ whole) (NN body) (NN unto)) (ADVP (PRP itself)))) (. .)))
The case law is a whole body unto itself, because it perplexes some people. 
( ( The ( case law ) ) ( ( ( ( is ( ( a ( whole ( body unto ) ) ) itself ) ) , ) ( because ( it ( perplexes ( some people ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN case) (NN law)) (VP (VBZ is) (NP (NP (DT a) (JJ whole) (NN body) (NN unto)) (ADVP (PRP itself))) (, ,) (SBAR (IN because) (S (NP (PRP it)) (VP (VBZ perplexes) (NP (DT some) (NNS people)))))) (. .)))