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