The L was based on the W , but a comparison, albeit superficial, reveals a number of differences, to 
( ( ( ( ( The L ) ( was ( based ( on ( the W ) ) ) ) ) , ) but ) ( ( ( ( ( a comparison ) , ) ( albeit superficial ) ) , ) ( ( ( reveals ( ( a number ) ( of differences ) ) ) , ) to ) ) )
(ROOT (FRAG (S (S (NP (DT The) (NNP L)) (VP (VBD was) (VP (VBN based) (PP (IN on) (NP (DT the) (NNP W)))))) (, ,) (CC but) (S (NP (NP (DT a) (NN comparison)) (, ,) (VP (ADVP (IN albeit)) (VBN superficial)) (, ,)) (VP (VBZ reveals) (NP (NP (DT a) (NN number)) (PP (IN of) (NP (NNS differences)))) (, ,) (PP (TO to)))))))
There are seventeen differences between the L and the W. 
( There ( are ( ( seventeen differences ) ( between ( ( ( the L ) and ) ( the W. ) ) ) ) ) )
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD seventeen) (NNS differences)) (PP (IN between) (NP (NP (DT the) (NNP L)) (CC and) (NP (DT the) (NNP W.))))))))