it 's propelled by the acting 
(ROOT (S (NP (PRP it)) (VP (VBZ 's) (VP (VBN propelled) (PP (IN by) (NP (DT the) (NN acting)))))))
(ROOT (S (NP (PRP )) (VP (VBZ ) (VP (VBN ) (PP (IN ) (NP (DT ) (NN )))))))