the best performance from either in years 
(ROOT (NP (NP (DT the) (JJS best) (NN performance)) (PP (IN from) (NP (CC either))) (PP (IN in) (NP (NNS years)))))
(ROOT (NP (NP (DT ) (JJS ) (NN )) (PP (IN ) (NP (CC ))) (PP (IN ) (NP (NNS )))))