( ( ( ( ( There ( are ( ( different types ) ( of diabetes ) ) ) ) , ) but ) ( ( two types ) ( ( are most ) ( usually discussed ) ) ) ) . )
(ROOT (S (S (NP (EX There)) (VP (VBP are) (NP (NP (JJ different) (NNS types)) (PP (IN of) (NP (NN diabetes)))))) (, ,) (CC but) (S (NP (CD two) (NNS types)) (VP (VBP are) (ADVP (RBS most)) (VP (ADVP (RB usually)) (VBN discussed)))) (. .)))
There are different types of diabetes, but two types are most usually discussed.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD two) (JJ different) (JJ main) (NNS types)) (PP (IN of) (NP (NN diabetes))))) (. .)))