that he tosses a kitchen sink onto a story already overladen with plot conceits 
(ROOT (SBAR (IN that) (S (NP (PRP he)) (VP (VBZ tosses) (NP (DT a) (NN kitchen) (NN sink)) (PP (IN onto) (NP (NP (DT a) (NN story)) (ADJP (RB already) (JJ overladen) (PP (IN with) (NP (NN plot) (NNS conceits))))))))))
(ROOT (SBAR (IN ) (S (NP (PRP )) (VP (VBZ ) (NP (DT ) (NN ) (NN )) (PP (IN ) (NP (NP (DT ) (NN )) (ADJP (RB ) (JJ ) (PP (IN ) (NP (NN ) (NNS ))))))))))