( ( The ( ( most common ) cause ) ) ( ( is ( ( ( ( diabetes , ) ( both ( Type 1 ) ) ) and ) ( Type 2 ) ) ) . ) )
(ROOT (S (NP (DT The) (ADJP (RBS most) (JJ common)) (NN cause)) (VP (VBZ is) (NP (NP (NN diabetes)) (, ,) (NP (DT both) (NNP Type) (CD 1)) (CC and) (NP (NNP Type) (CD 2)))) (. .)))
The most common cause is diabetes, both Type 1 and Type 2.
(ROOT (S (NP (NNP Type) (CD 2)) (VP (VBZ is) (NP (NP (DT the) (ADJP (RBR more) (JJ common)) (NN type)) (PP (IN of) (NP (NN diabetes))))) (. .)))