( ( ( ( ( ( Manned vehicles ) ( have advantages ) ) , ) but ) ( there ( ( can also ) ( be ( ( ( autonomous or ) ( remotely controlled ) ) vehicles ) ) ) ) ) . )
(ROOT (S (S (NP (JJ Manned) (NNS vehicles)) (VP (VBP have) (NP (NNS advantages)))) (, ,) (CC but) (S (NP (EX there)) (VP (MD can) (ADVP (RB also)) (VP (VB be) (NP (ADJP (ADJP (JJ autonomous)) (CC or) (ADJP (RB remotely) (JJ controlled))) (NNS vehicles))))) (. .)))
Manned vehicles have advantages, but there can also be autonomous or remotely controlled vehicles.
(ROOT (S (NP (NNP Remote-control) (NNS vehicles)) (VP (VBP are) (ADJP (JJ able) (S (VP (TO to) (VP (VB go) (PP (TO to) (NP (DT the) (JJS deepest) (NN ocean) (NN floor)))))))) (. .)))