Over the past week PTA he has been more somnolent and difficult to arrouse. .
 He is disorientated and complains of weakness 
(ROOT (S (PP (IN Over) (NP (DT the) (JJ past) (NN week))) (NP (NNP PTA)) (NP (PRP he)) (VP (VBZ has) (VP (VBN been) (ADJP (JJR more) (JJ somnolent) (CC and) (JJ difficult)) (S (VP (TO to) (VP (VB arrouse)))))) (. .) (. .)))
(ROOT (S (NP (PRP He)) (VP (VP (VBZ is) (VP (VBN disorientated))) (CC and) (VP (VBZ complains) (PP (IN of) (NP (NN weakness)))))))
( ( Over ( the ( past week ) ) ) ( PTA ( he ( ( ( has ( ( been ( more ( ( somnolent and ) difficult ) ) ) ( to arrouse ) ) ) . ) . ) ) ) )
( He ( ( ( is disorientated ) and ) ( complains ( of weakness ) ) ) )