fails because it demands that you suffer the dreadfulness of war from both sides . 
(ROOT (S (VP (VBZ fails) (SBAR (IN because) (S (NP (PRP it)) (VP (VBZ demands) (SBAR (IN that) (S (NP (PRP you)) (VP (VBP suffer) (NP (NP (DT the) (NN dreadfulness)) (PP (IN of) (NP (NN war))) (PP (IN from) (NP (DT both) (NNS sides))))))))))) (. .)))
(ROOT (S (VP (VBZ ) (SBAR (IN ) (S (NP (PRP )) (VP (VBZ ) (SBAR (IN ) (S (NP (PRP )) (VP (VBP ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (NN ))) (PP (IN ) (NP (DT ) (NNS ))))))))))) (. )))