( Vertregt ( ( is ( ( the ( ancient remnant ) ) ( of ( a ( large ( lunar ( impact crater ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Vertregt)) (VP (VBZ is) (NP (NP (DT the) (JJ ancient) (NN remnant)) (PP (IN of) (NP (DT a) (JJ large) (NN lunar) (NN impact) (NN crater))))) (. .)))
Vertregt is the ancient remnant of a large lunar impact crater.
(ROOT (S (NP (DT The) (NN lunar) (NN landscape)) (VP (VBZ is) (VP (VBN covered) (PP (IN by) (NP (NP (NNS craters)) (VP (VBN caused) (PP (IN by) (NP (JJ asteroid) (NNS impacts)))))))) (. .)))