( ( Although ( ( the Koalas ) ( are marsupials ) ) ) ( , ( they ( ( ( are often ) ( mistaken ( for bears ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN Although) (S (NP (DT the) (NNPS Koalas)) (VP (VBP are) (ADJP (JJ marsupials))))) (, ,) (NP (PRP they)) (VP (VBP are) (ADVP (RB often)) (VP (VBN mistaken) (PP (IN for) (NP (NNS bears))))) (. .)))
Although              the Koalas are marsupials, they are often mistaken for bears.
(ROOT (S (NP (PRP You)) (VP (VBP call) (SBAR (WHNP (DT an) (NN animal) (WHPP (IN in) (WHNP (WDT which)))) (S (NP (NP (DT the) (NN embryo)) (, ,) (VP (ADVP (RB often)) (VBN termed) (NP (DT a) (NN joey))) (, ,)) (VP (VP (VBZ is) (VP (VBN born) (S (ADJP (JJ immature))))) (CC and) (VP (MD must) (VP (VB complete) (NP (PRP$ its) (NN development)) (PP (IN outside) (NP (NP (DT the) (NN mother) (POS 's)) (NN body))))) (NP (DT a) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN marsupial)))))) (. .)))