( ( In ( the ( long term ) ) ) ( , ( ( ( good control ) ( of sugar ) ) ( ( may ( ( ( prevent or ) delay ) ( complications ( of ( ( type ( 2 diabetes ) ) ( such ( as ( ( ( ( ( ( heart disease ) , ) ( kidney disease ) ) , ) and ) blindness ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (DT the) (JJ long) (NN term))) (, ,) (NP (NP (JJ good) (NN control)) (PP (IN of) (NP (NN sugar)))) (VP (MD may) (VP (VB prevent) (CC or) (VB delay) (NP (NP (NNS complications)) (PP (IN of) (NP (NP (NN type) (CD 2) (NN diabetes)) (PP (JJ such) (IN as) (NP (NP (NN heart) (NN disease)) (, ,) (NP (NN kidney) (NN disease)) (, ,) (CC and) (NP (NN blindness))))))))) (. .)))
In the long term, good control of sugar may prevent or delay complications of type 2 diabetes such as heart disease, kidney  disease, and blindness.
(ROOT (S (NP (NNP Diabetes)) (VP (VP (VBZ is) (ADJP (JJ unpreventable) (PP (IN in) (NP (DT the) (NN type) (CD one) (NN form))))) (CC but) (VP (MD may) (VP (VB be) (VP (VBN prevented) (PP (IN by) (NP (NN diet))) (SBAR (IN if) (S (NP (PRP it)) (VP (VBZ is) (PP (IN of) (NP (DT the) (JJ second) (NN type)))))))))) (. .)))
Diabetes is unpreventable in the type one form but may be prevented by diet if it is of the second type.