To see the desert at its best, go out at dawn and at sunset.
( ( To ( ( see ( the desert ) ) ( at ( its best ) ) ) ) ( , ( ( ( go out ) ( ( ( at dawn ) and ) ( at sunset ) ) ) . ) ) )
(ROOT (S (S (VP (TO To) (VP (VB see) (NP (DT the) (NN desert)) (PP (IN at) (NP (PRP$ its) (JJS best)))))) (, ,) (VP (VBP go) (PRT (RP out)) (PP (PP (IN at) (NP (NN dawn))) (CC and) (PP (IN at) (NP (NN sunset))))) (. .)))
Go at dawn and sunset to see the desert at optimal times.
( ( ( Go ( at ( ( dawn and ) sunset ) ) ) ( to ( ( see ( the desert ) ) ( at ( optimal times ) ) ) ) ) . )
(ROOT (S (VP (VB Go) (PP (IN at) (NP (NN dawn) (CC and) (NN sunset))) (S (VP (TO to) (VP (VB see) (NP (DT the) (NN desert)) (PP (IN at) (NP (JJ optimal) (NNS times))))))) (. .)))