( ( ( ( ( An organ ) , ) ( such ( as ( the heart ) ) ) ) , ) ( ( is ( ( made up ) ( of ( groups ( of ( tissues ( that ( ( work together ) ( to ( perform ( a ( specific function ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT An) (NN organ)) (, ,) (PP (JJ such) (IN as) (NP (DT the) (NN heart))) (, ,)) (VP (VBZ is) (VP (VBN made) (PRT (RP up)) (PP (IN of) (NP (NP (NNS groups)) (PP (IN of) (NP (NP (NNS tissues)) (SBAR (WHNP (WDT that)) (S (VP (VBP work) (ADVP (RB together)) (S (VP (TO to) (VP (VB perform) (NP (DT a) (JJ specific) (NN function)))))))))))))) (. .)))
An organ, such as the heart, is made up of groups of tissues that work together to perform a specific function.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NP (JJ different) (NNS types)) (PP (IN of) (NP (NNS tissues)))) (VP (VBP work) (ADVP (RB together)) (S (VP (TO to) (VP (VB perform) (NP (DT a) (JJ unique) (NN function)))))))) (, ,) (NP (PRP they)) (VP (VBP form) (NP (NN organ))) (. .)))