what kind of sewage they shovel into their mental gullets to simulate sustenance 
(ROOT (SBAR (WHNP (WHNP (WDT what) (NN kind)) (PP (IN of) (NP (NN sewage)))) (S (NP (PRP they)) (VP (VBP shovel) (PP (IN into) (NP (PRP$ their) (JJ mental) (NNS gullets))) (S (VP (TO to) (VP (VB simulate) (NP (NN sustenance)))))))))
(ROOT (SBAR (WHNP (WHNP (WDT ) (NN )) (PP (IN ) (NP (NN )))) (S (NP (PRP )) (VP (VBP ) (PP (IN ) (NP (PRP$ ) (JJ ) (NNS ))) (S (VP (TO ) (VP (VB ) (NP (NN )))))))))