The recurrent motif of time travel came to the fore in H.G.
( ( ( The ( recurrent motif ) ) ( of ( time travel ) ) ) ( ( came ( to ( the fore ) ) ) ( in H.G. ) ) )
(ROOT (S (NP (NP (DT The) (JJ recurrent) (NN motif)) (PP (IN of) (NP (NN time) (NN travel)))) (VP (VBD came) (PP (TO to) (NP (DT the) (NN fore))) (PP (IN in) (NP (NNP H.G.))))))
H.G did not invent any sort of motif for time travel. 
( H.G ( ( ( did not ) ( ( invent ( ( any sort ) ( of motif ) ) ) ( for ( time travel ) ) ) ) . ) )
(ROOT (S (NP (NNP H.G)) (VP (VBD did) (RB not) (VP (VB invent) (NP (NP (DT any) (NN sort)) (PP (IN of) (NP (NN motif)))) (PP (IN for) (NP (NN time) (NN travel))))) (. .)))