Although we associate trench warfare with World War I, trenches were characteristic also of the Civil War.
( ( Although ( we ( ( associate ( trench warfare ) ) ( with ( World ( War I ) ) ) ) ) ) ( , ( trenches ( ( ( were characteristic ) ( also ( of ( the ( Civil War ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN Although) (S (NP (PRP we)) (VP (VBP associate) (NP (NN trench) (NN warfare)) (PP (IN with) (NP (NNP World) (NNP War) (PRP I)))))) (, ,) (NP (NNS trenches)) (VP (VBD were) (ADJP (JJ characteristic)) (PP (ADVP (RB also)) (IN of) (NP (DT the) (NNP Civil) (NNP War)))) (. .)))
More people died in trenches in World War I than in the Civil War.
( ( More people ) ( ( ( died ( in ( trenches ( in ( World ( War I ) ) ) ) ) ) ( than ( in ( the ( Civil War ) ) ) ) ) . ) )
(ROOT (S (NP (JJR More) (NNS people)) (VP (VBD died) (PP (IN in) (NP (NP (NNS trenches)) (PP (IN in) (NP (NNP World) (NNP War) (PRP I))))) (PP (IN than) (PP (IN in) (NP (DT the) (NNP Civil) (NNP War))))) (. .)))