( Wings ( ( evolved ( in ( ( a ( bird ancestor ) ) ( that ( lived ( in trees ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Wings)) (VP (VBD evolved) (PP (IN in) (NP (NP (DT a) (NN bird) (NN ancestor)) (SBAR (WHNP (WDT that)) (S (VP (VBD lived) (PP (IN in) (NP (NNS trees))))))))) (. .)))
Wings evolved in a bird ancestor that lived in trees.
(ROOT (S (NP (NP (DT The) (NN bird) (NN ancestor)) (SBAR (WHNP (WDT that)) (S (VP (VBD lived) (PP (IN in) (NP (NNS trees))))))) (VP (VBD developed) (NP (NP (NNS wings)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADVP (RB commonly)) (VP (VBN associated) (PP (IN with) (NP (NNS birds))))))))) (. .)))
The bird ancestor that lived in trees developed wings, which is commonly associated with birds.