it does so without compromising that complexity . 
(ROOT (S (NP (PRP it)) (VP (VBZ does) (ADVP (RB so)) (PP (IN without) (S (VP (VBG compromising) (NP (DT that) (NN complexity)))))) (. .)))
(ROOT (S (NP (PRP )) (VP (VBZ ) (ADVP (RB )) (PP (IN ) (S (VP (VBG ) (NP (DT ) (NN )))))) (. )))