( ( A sinusoid ) ( ( is ( ( a ( small ( blood vessel ) ) ) ( that ( is ( ( a type ) ( of ( ( capillary similar ) ( to ( a ( fenestrated endothelium ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN sinusoid)) (VP (VBZ is) (NP (NP (DT a) (JJ small) (NN blood) (NN vessel)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (NP (NP (DT a) (NN type)) (PP (IN of) (ADJP (ADJP (RB capillary) (JJ similar)) (PP (TO to) (NP (DT a) (JJ fenestrated) (NN endothelium))))))))))) (. .)))
A sinusoid is a small blood vessel that is a type of capillary similar to a fenestrated endothelium.
(ROOT (S (NP (NNS Capillaries)) (VP (VBP are) (NP (NP (DT the) (JJS smallest) (NN type)) (PP (IN of) (NP (NN blood) (NNS vessels))))) (. .)))